We Built the Craziest Cummins We've Ever Made to Compete at UCC 2026 (Here's Everything We Did)

Common-rail is a diesel fuel-injection system that stores fuel in a high-pressure “rail” and then delivers it to the injectors on demand. Compared with older systems, it can provide more precise timing and multiple injection events per cycle, which helps power and drivability—especially on high-boost builds.

“P pump” refers to the Bosch VP-style inline-pump family used on many older Cummins diesels (often called P-pump). It’s a mechanical/hydraulic injection system that can be strong and tunable, but it’s generally less flexible than common-rail for extreme fueling and fine control.

Horsepower is an engineering measure of how much work an engine can do over time. In this context, the host is using it as a power target to describe how hard the truck was being pushed during testing.

An “air kill” is a race-use safety/control method that quickly stops or limits engine fueling by interrupting the intake air path (or otherwise cutting the engine’s ability to make power). It’s used to prevent runaway or to shut the engine down fast when something goes wrong under boost.

A drag strip is a straight-line racing track where cars run timed acceleration over a fixed distance (often focusing on launch and traction). Diesel builds are especially sensitive to fueling, turbo response, and traction because small changes can dramatically affect elapsed time and 60-foot performance.

A “cast wheel” describes the compressor or turbine wheel being made via casting rather than billet machining. Wheel material and manufacturing method affect strength, efficiency, and how well the turbo survives high boost and high exhaust-gas temperatures.

A turbocharger uses exhaust gas to spin a turbine that compresses intake air, allowing more oxygen into the engine for more fuel and power. On diesel builds, turbo sizing and matching to fueling are critical because too much boost or poor control can quickly over-stress pistons and turbos.

A flow bench measures how much air (or fuel/air mixture) an engine component can move—most often cylinder heads, intake ports, or valves. It helps builders identify restrictions and choose porting/cam/turbo setups that improve breathing and combustion efficiency.

“No prep” refers to drag-racing track preparation where the surface isn’t heavily treated with traction chemicals. That usually makes launches harder to control, increasing the importance of drivetrain setup (like four-wheel drive) and tuning to avoid wheelspin.

Four-wheel drive (4WD) sends power to both the front and rear axles, improving traction during hard launches. In drag racing, that can reduce wheelspin and help the engine’s torque translate into forward motion—often improving 60-foot times.

Nitro-methanol is a racing fuel blend that combines nitromethane with methanol. It’s used in drag racing because it can deliver very high energy content and support extreme power levels, but it also increases thermal and mechanical stress on engines and turbos.

“12 valve” refers to a Cummins cylinder head design with 12 valves total per engine (commonly associated with certain 5.9L/6BT-era Cummins variants). Valve count and head design affect airflow, combustion characteristics, and how the engine responds to turbo and fuel upgrades.

In drag racing and diesel competition, a “cage” is a roll cage: a welded metal safety structure inside the cab that protects the driver during crashes and helps the chassis survive high loads. When power levels rise, competitors often add or upgrade the cage to meet rulebook safety requirements and to handle the stresses of hard launches and traction events.

UCC refers to a competition format where diesel trucks are built and tuned specifically for drag racing. In this episode, the hosts talk about building a Cummins truck to meet UCC rules and compete at the 2026 event.

A tube chassis uses a welded framework of steel tubes instead of relying on a traditional stamped unibody or full factory frame. For drag racing, it’s often used to reduce weight and control stiffness so the truck can launch and stay stable under hard acceleration.

UCC drag-race rules appear to set a minimum vehicle weight, and the hosts are targeting about 4,400 pounds to meet that requirement. They also contrast it with their previous lightest competing weight, implying weight directly affects competitiveness and compliance.

The “drag race portion” is the straight-line acceleration segment of the competition, where vehicles are judged on how quickly they cover a set distance. The hosts mention a minimum weight requirement specifically for this segment, highlighting how rules can differ by event type within the same competition.

Fiberglass is a composite material often used in racing for body panels because it can be lighter than steel. The speaker’s mention suggests they’re using fiberglass to reduce weight while still shaping the truck’s body.

“Back half of front half” is describing a weight-reduction strategy by removing or trimming sections of the truck’s body/chassis area. It implies a targeted approach to cutting mass while keeping the structure functional for competition.

Sled pulling is a motorsport where a truck pulls a heavy sled along a track, typically with increasing resistance and strict rules. It heavily rewards low-end torque, traction, and drivetrain durability because you’re fighting load the whole time.

Drag racing is a straight-line acceleration event where cars/trucks run timed passes over a short distance. It tends to emphasize launch control, traction management, and repeatable power delivery across multiple runs.

A cast piston is a piston made by pouring molten metal into a mold, which is generally less expensive than forged pistons. In high-power diesel builds, piston strength and how they handle heat and pressure can be a limiting factor, so switching piston construction is a common reliability/performance upgrade path.

An aftermarket block is an engine block made or modified by a company other than the original equipment manufacturer (OEM). The hosts are pointing out fitment/machining differences—like freeze plug sizing or tapping locations—that can affect how well the engine assembles and how reliably it holds power.

A freeze plug (also called a core plug) is a small metal plug installed in an engine block’s coolant passages. It’s designed to seal the cooling system while allowing for manufacturing/boring access; if the plug size or fit is wrong, it can cause leaks—especially problematic when the engine is under heavy load.

OEM block means the original equipment manufacturer engine block—the factory casting used in the production engine. Here, they’re contrasting it with their own/aftermarket blocks and saying the only block they’ve damaged was the OEM one, implying their built blocks have been more durable.

“Valves” are the engine’s intake/exhaust doors that control airflow. Bigger valves increase the engine’s ability to move air and exhaust gases, which can support more power when paired with the right cam and head work.

“Rods” here refers to connecting rods, which transmit piston motion to the crankshaft. Upgrading rods is a common way to improve strength and durability for higher cylinder pressures or aggressive builds.

The camshaft controls valve timing by opening and closing the valves at specific times and durations. Swapping or upgrading the cam is one of the biggest ways to change how an engine makes power across the RPM range.

Main caps are the structural bearing housings that hold the crankshaft in the engine block. Upgrading fasteners or using stronger main-cap hardware helps keep crankshaft alignment and bearing clearances stable under load.

“14 mil” appears to refer to a fastener or stud size/thickness used on the engine’s main caps. In engine building, fastener sizing is important because it affects clamping force and how well the engine holds together under high load.

“Sleeves” are cylinder liners inserted into the block to provide a replaceable, hardened surface for the cylinders. Saying “no sleeves” implies the engine used the original cylinder bores rather than installing liners.

Calling it a “stock engine” means the core block and basic architecture were kept factory, rather than using a fully custom long-block. The build’s changes were focused on specific upgrades like the cam and connecting rods.

A “long block” is an engine assembly that includes major internal components (typically the rotating assembly and cylinder head(s)) but may exclude accessories like intake plumbing or electronics. In contrast, a “short block” usually omits the cylinder head(s).

A “short block” generally refers to the engine’s bottom end (block plus rotating assembly) without the cylinder head(s). It’s a common way to describe how much of the engine was reused versus rebuilt.

“Piston wall” likely refers to piston-to-cylinder clearance or how tight the piston fits in the bore. Builders “code” (fit/measure) pistons to control clearances so the engine can handle heat and expansion without scuffing or losing compression.

The hosts mention traveling to Arizona to debut the engine build, framing it as a real-world test rather than a bench-only prototype.

A “personal best” is the best performance a driver has achieved so far, often measured by elapsed time (ET) and/or trap speed in drag racing. It’s a key metric because it indicates improvement even if the car isn’t winning yet.

A “four link” is a rear suspension setup that uses four control arms (links) to locate the axle and manage how the truck squats, lifts, and reacts under acceleration and braking. In drag racing builds, it’s often tuned to keep the tires planted and control axle movement for repeatable launches.

“Shock adjustment” refers to changing how the shocks dampen movement—typically affecting ride height, squat, and how quickly the suspension responds during launch and weight transfer. In drag racing, even small shock changes can alter traction and consistency.

In a performance diesel context, a “tune” is a software calibration change that alters engine parameters like fueling and boost targets. The goal is to make the truck produce more power (or deliver it more consistently) for a specific track pass or conditions.

Leaf springs are a type of suspension that uses stacked metal strips to support the axle and control ride movement. In drag racing, they can affect how the truck squats on launch and how consistently it transfers traction to the tires.

“60 foots” refers to the elapsed time for the car/truck to cover the first 60 feet from the start line. In drag racing, it’s a key indicator of launch quality—traction, suspension behavior, and how well the power is applied early.

Nitrous (nitrous oxide) is an add-on power system that injects gas into the engine to increase oxygen availability. That lets the engine burn more fuel and make a big power boost for drag-racing-style runs, but it’s typically used in controlled bursts.

Launch strategy is how the driver and tuning manage the start—things like when to apply power, how hard to hit it, and how to time traction control or boost/nitrous engagement. Small changes can significantly alter early acceleration and therefore the 60-foot time.

In nitrous systems, the “bottle” is the pressurized container that holds the nitrous oxide. As the bottle level drops, the system may not deliver the same flow rate, which can reduce how much power the nitrous produces on later passes.

Pistons are the engine components that move up and down inside the cylinders, transferring combustion force to the crankshaft. In high-power builds, piston material and design (cast vs forged, cooling features, etc.) strongly influence durability.

In this context, “transmission” refers to the gearbox and its internal components that handle torque transfer during launches and pulls. The host says they wanted to try “some stuff in the transmission,” implying they’re changing how the drivetrain behaves under load for drag and sled-pull events.

In drag racing, “tech” is the inspection process where officials check your car or truck for safety and rule compliance before you can make passes. It can include verifying things like tires, fuel system setup, and whether the vehicle meets the class rules.

A “mile an hour cap” here means the track imposed a maximum speed limit for the vehicle based on eligibility or licensing status. In practice, it forces the driver to short-shift or lift earlier so the run stays under the allowed speed threshold.

The “eighth” refers to running the eighth-mile distance, a common drag racing format where timing and speed checks are taken at that shorter distance. Many classes and test sessions use the eighth-mile because it’s easier to manage traction and vehicle stress.

The “quarter” is shorthand for the quarter-mile timing distance in drag racing. Officials often compare your speed/time at specific markers (like the eighth-mile and quarter-mile) to enforce class rules and safety limits.

Josh McCormick is described as traveling from California to help as a pit crew member and then getting permission to drive the truck on the drag strip. The hosts use his involvement to highlight both his competence and the truck’s consistency.

A trans brake is a drag-racing feature that holds the transmission in a locked state at launch RPM, allowing the engine to build boost/torque without moving the car. When the driver releases it, the car launches hard and consistently. It’s commonly used to improve reaction time and traction management on sticky drag tires.

A drag slick is a tire designed specifically for straight-line acceleration, typically with a smooth tread and a compound optimized for short, high-grip launches. Because they’re built for traction, they can be sensitive to damage like punctures or cuts. A slow leak from a drag slick can ruin consistency and trap performance.

A “track calculator” is the drag strip’s timing/estimation tool that converts run data (like elapsed time and speed) into estimated horsepower or other metrics. It’s not a dyno measurement, but it’s useful for quick comparisons.

An aftermarket ECU is a non-factory engine computer (or a reflash/tune) used to change how the engine runs. Enthusiasts use it to unlock more tuning options for fuel, boost, and nitrous behavior than the stock calibration allows.

They’re referencing the ECM calibration used in 2006–2007 Cummins trucks (the “0607” era). The point is that their quarter-mile/drag results were achieved using the factory-style computer for that model year range.

“Micro records” is a niche racing term for small, category-specific benchmarks rather than overall world records. In practice, it can mean ranking within a narrow class (like drivetrain type and vehicle category) or hitting a specific “fastest in class” milestone.

An axle swap is replacing the vehicle’s axle assembly with a different axle setup. In performance builds, it’s often done to change gear ratios, improve strength, or match parts to the power level and traction needs of the competition.

A subframe is a structural frame that supports components like the engine, suspension, or drivetrain. A “miniature subframe” implies a shortened or reduced subframe design to package components differently, reduce weight, or improve how the truck responds under sled-pulling loads.

An SQHD rear axle is a heavy-duty axle assembly built for high load and traction, commonly sourced from commercial trucks. In sled pulling, the axle choice matters because it has to survive repeated torque spikes while keeping the drivetrain aligned under extreme tire loading.

“Dual dual cuts” here means running four rear tires in a dual setup (two tires per side) on the rear axle. Sled pulling teams do this to increase the contact patch and traction, especially when the rules allow it, compared with a single rear tire setup.

The “F 700” front axle refers to a heavy-duty axle used on Ford F-series trucks, adapted here for sled pulling. The speaker emphasizes it’s a large ring-gear axle with a high-pinion design, chosen because it can handle higher torque loads and drivetrain stress.

A “ring geared” axle means the differential uses a large ring gear, which typically allows stronger gear teeth and better load capacity. In high-torque applications like sled pulling, larger ring gears can reduce stress and help the drivetrain survive repeated pulls.

Dana 60 is a well-known heavy-duty axle family from Dana/Spicer, commonly used in trucks and off-road builds. In this context, the hosts are comparing Dana 60 variants (high pinion vs low pinion) to explain which setup better survives the torque and gear-loading demands of sled pulling.

A “high pinion” axle places the pinion gear higher relative to the ring gear, which changes the gear mesh geometry and how the gears load under torque. The speaker argues it’s stronger here because it loads the correct side of the gear during drive, improving resistance to flex and separation.

A “low pinion” axle has the pinion gear positioned lower than in a high-pinion design. The speaker claims low-pinion axles are better suited for drag racing and clearance, but that they can load the “wrong side” of the ring-and-pinion gear during drive, which affects strength under flex.

Hypoid (hypoid) gears use a spiral bevel gear setup that allows the pinion and ring gear shafts to be offset. The speaker explains that the direction of drive affects which side of the gear teeth is loaded as the axle flexes, and that loading the correct side helps prevent the gears from trying to separate.

U joints (universal joints) are the driveline joints that allow torque transfer while accommodating angle changes between components. In sled pulling, stronger or larger U-joints help handle the vibration and torque spikes that come from aggressive traction and drivetrain articulation.

A steering box is the gearbox that converts the steering wheel’s rotation into the movement needed to steer the wheels. In this context, a “factory” steering box means they tried using the stock steering hardware from the base truck, which didn’t hold up well for their competition loads.

A subframe/sub-chassis is a secondary structural frame mounted to the main vehicle frame to carry specific components. Here, they’re building a dedicated chassis for sled pulling so the axle, hitch, and weight-box loads stay centralized and don’t rely on bolt joints that could fail under extreme forces.

Shear is a type of force that tries to slide one part sideways relative to another. Bolt connections can fail in shear when competition loads are high, so the speaker emphasizes using a welded, one-piece structure to reduce the chance of bolt-joint failure.

A drag race chassis is a purpose-built frame/suspension setup optimized for straight-line acceleration. It’s usually designed around weight placement, traction, and packaging of drivetrain components so the car can launch hard without instability.

In sled pulling, the hitch is the connection between the vehicle and the sled that transfers pulling forces. Because it must clear suspension/drivetrain components and work through different angles, it strongly influences how the rear of the chassis is packaged.

A drive shaft shield is a protective cover around the driveshaft to help contain debris and reduce the chance of damage if the shaft fails. In high-load builds, it can become bulky because it must accommodate additional drivetrain components and clearances.

SCS is an acronym used in some diesel drag/pulling builds for a drivetrain-related component that must be packaged near the driveshaft. In this context, the speaker says it forces extra space and drives the size of the drive shaft shield and other crossmembers.

“Pounds per inch” (lb/in) is the spring rate: how much force the spring needs to compress by one inch. A 1000 lb/in spring is extremely stiff, which helps control chassis movement under heavy loads and hard launches.

Coilovers combine a coil spring and a shock absorber into one assembly, letting you tune ride height and spring behavior. Using them on the front helps the chassis stay stable when weight shifts during acceleration, braking, and cornering.

A chassis built from square tubing is a common fabrication approach for custom and competition vehicles because it’s strong, weldable, and easy to package. The speaker is describing how they had to plan mounting points and suspension geometry so the truck can sit correctly and move predictably.

“Spooling” here refers to a drivetrain setup where the wheels/axles are effectively locked together under load, so the tires resist turning. In practice, that can make steering feel impossible until traction breaks and the tires can rotate at different speeds.

A “full hydro kit” is a hydraulic steering conversion that replaces or supplements mechanical steering with hydraulic assist. It typically uses a hydraulic cylinder and control valve to generate steering force, which can dramatically improve steering feel and authority on heavy, high-traction builds.

A double-ended hydraulic cylinder has pressurized fluid acting on both sides of the piston, allowing strong, controlled bidirectional movement. In steering systems, that helps the hydraulic assist respond quickly and hold steering under load.

An orbital valve is a hydraulic control valve used in power steering to meter fluid based on steering input. It converts the driver’s steering movement into precise hydraulic flow to the cylinder, improving steering response and reducing lag.

“Drag ship” here appears to mean the drag-racing track or staging area where the truck runs. The context is about observing the truck’s behavior while going down the track, which is typical when diagnosing front-end instability.

A “weight box” is a ballast structure used to place weight in a specific location on the truck. In drag and sled-pull competition, where traction and balance are everything, the weight box position and stiffness can strongly affect how the truck loads the suspension and how much the front end bounces or wanders.

“Hydro front steering” means the truck’s front steering is powered by hydraulics instead of relying purely on mechanical linkage and manual effort. In drag and sled-pull setups, it can help keep steering response consistent under heavy loads and vibration, which matters when the front end starts to wander.

“Tick welding” is a welding technique where short welds are placed intermittently (like “tacks” or small segments) rather than running continuous beads. It’s often used to manage heat input and distortion, especially on custom chassis fabrication where alignment and warping are concerns.

“MIG weld” refers to MIG (Metal Inert Gas) welding, a process that uses a continuously fed wire electrode and shielding gas to create welds. It’s commonly chosen for faster, more consistent fabrication compared with slower tack-and-build methods, which fits the “tens of hours” and “50 pounds of wire” discussion.

John Schrotel is identified as the fabricator involved in the build, credited with taking a turn on the welding work. In this context, he represents the specialized race-fab expertise needed for custom chassis and steering modifications.

A “worm screw” is a gear mechanism where a screw drives a gear, providing high mechanical advantage and fine control. Here, the host is describing a limitation with their lifting setup and how they needed a specific adjustment style to get the lift height/fit they wanted.

Electric jacks are powered lifting actuators that raise a vehicle or structure using an electric motor and screw mechanism. The host compares expensive electric-jack sets (quoted at thousands of dollars) versus a cheaper solution using RV landing gear.

“Landing gear” are the extendable supports used on trailers so they can stand up when disconnected. In this build, the hosts repurpose RV-style landing gear jacks because they offer a known lift height (around 22–24 inches) without needing expensive custom equipment.

A “trailer jack” is a generic term for a lifting device used to raise a trailer’s front or rear when it’s not hitched. The speaker notes that searching for “trailer jack” doesn’t yield the right products, so they instead look for “landing gear” used on RVs that provide the needed lift.

In hitching and weight-box setups, “pins” are the locking fasteners that secure attachments so they can’t shift or come loose under load. The host emphasizes that the process is fiddly: you have to align everything, then insert the pins correctly before moving on to hauling the weights.

A “deck plate kit” refers to a hardware kit used to adapt or configure an engine for a specific build standard—commonly involving a steel plate and sleeves that change how the engine’s top-end is set up. In competition builds, these kits are often part of the rules-compliant foundation before adding custom internal parts.

“Dynoed” means testing the engine on a dynamometer (a machine that measures power and torque under controlled conditions). Teams use dyno sessions to validate tuning changes and predict how the engine will behave in competition.

A “dyno event” is a scheduled session where teams run engines on a dynamometer to collect consistent data. It’s often used for tuning, troubleshooting, and comparing results across builds.

A “stock piston” is the factory piston that comes with the engine, rather than a custom forged or race-spec piston. Using stock pistons is often a baseline choice when the team wants to isolate which changes affect results.

A “new computer” refers to the engine control unit (ECU) or engine management system. Changing the ECU is a major tuning step because it controls fuel delivery, timing, and boost-related behavior to match the engine’s hardware.

“Deck plating” is a cylinder-block modification where the block’s top (the deck surface) is reinforced or extended to better support high cylinder pressures. In this build, it’s part of preparing the Cummins engine block for big internal upgrades so it can survive more boost and combustion stress.

A “waggler kit” refers to a specific cylinder/engine-building package used to change bore and piston/liner geometry for increased displacement or stronger cylinder support. Here it’s tied to the deck plate setup and the use of powerbore sleeves and diamond pistons.

“Powerbore sleeves” are cylinder liners installed into the engine block to restore or increase cylinder bore size and to improve durability. In high-output diesel builds, sleeves help manage heat and pressure while keeping the cylinder walls straight and strong.

An engine “girdle” (often called a main girdle) is a reinforcement bar/plate that ties into the main bearing area to reduce flex and improve crankshaft support. This build mentions a “Kenny’s point parts girdle,” suggesting additional bottom-end stiffness beyond the main caps.

“Line up and set up” here refers to the careful alignment and measurement work required when assembling a deck-plated, sleeved, and cap-reinforced bottom end. With these parts, small tolerance errors can affect crank alignment, bearing clearance, and long-term durability.

“Fastener holes” are the precisely located holes drilled to accept bolts/studs that clamp the deck plate to the engine block. Correct hole location and size are critical because they affect clamping force distribution and sealing under high cylinder pressure.

Tuning is adjusting engine control and calibration—like fuel delivery and timing—to match the hardware and the target power level. On a diesel, good tuning helps manage combustion so the engine can sustain high cylinder pressures without structural failure.

Cylinder pressure is the force created inside an engine’s combustion chamber during the power stroke. In a high-output diesel build, holding cylinder pressure means the engine is making strong combustion without damaging the block or letting pressures spike unpredictably.

Valve springs control how the engine’s valves open and close, especially at higher RPM. In performance builds, selecting the right valve springs and verifying their behavior (often including installed height and seat pressure) helps prevent valve float and keeps the valvetrain from being damaged.

A transfer case is the gearbox that routes power from the transmission to the front and/or rear axles in 4WD/AWD drivetrains. Choosing transfer-case gearing affects how the truck launches and how it stays in the power band during acceleration.

“Press” refers to the interference fit used when installing cylinder sleeves into an engine block. The amount of press fit changes how forces are shared between the sleeve and the block under combustion load, which can strongly affect durability in high-power builds.

Pressing sleeves into a block can preload the surrounding material, affecting how the block and sleeve expand under combustion. The speaker argues that excessive press can “preload the block,” so the sleeve doesn’t take the combustion forces as intended.

Darden is referenced as a sleeve manufacturer the speaker consulted about how much press fit to use when installing cylinder sleeves. The point is that some high-power sleeve setups avoid press to reduce unwanted preload on the engine block.

A press fit is when one part (like a cylinder sleeve) is installed with an interference fit—slightly larger than the hole—so it stays put without fasteners. The key tradeoff is sealing and heat transfer versus the risk of cracking or distortion if the fit is too tight or too loose.

Honing is the controlled abrasive finishing of the cylinder bore to create the correct surface finish and geometry for ring sealing. When the cylinder isn’t a simple solid block (e.g., sleeves), honing behavior can change, so the process has to be tuned to the actual setup.

Coolant is the liquid that carries heat away from the engine to prevent overheating. Leaking coolant around a sleeve indicates a sealing failure between the sleeve and block, which can lead to overheating and rapid engine damage under race loads.

The cylinder head is the top housing of the engine where the combustion chambers and valve gear live. In this context, they’re discussing machining and fitting work on the head and related components, which can strongly affect airflow and sealing.

“Max Five” refers to a specific engine control/computing platform used for tuning and controlling performance parameters. The speaker contrasts its limited capabilities with newer, more powerful controllers, implying it affects how precisely the system can manage signals and changes during runs.

A “missing tooth” refers to a pattern on a crankshaft position sensor trigger wheel where one tooth is intentionally absent. Engine controllers use that gap to determine crank position and timing, but some aftermarket signal setups can “freak out” if they don’t handle the missing-tooth pattern correctly.

An “RPM signal” is the engine-speed (revolutions per minute) input used by controllers and data systems to synchronize tuning and control. The speaker warns that tapping RPM from a factory crank sensor can cause issues because of the sensor’s missing-tooth pattern.

“Boost safety” is a protective control strategy that limits turbo boost to a target ceiling to prevent overboost. The speaker describes using the controller to act like a safety threshold (e.g., “40 pounds”) and then enabling full-throttle behavior.

“Full throttle” is the driver commanding maximum pedal position, which typically triggers the ECU to enter a more aggressive fueling/boost/timing strategy. Here it’s also used as a control input to switch the nitrous/boost behavior on during dyno testing.

“Pulse with modulation” (likely PWM: pulse-width modulation) is a method of controlling power or signal behavior by rapidly switching on/off and varying the duty cycle. The speaker contrasts PWM behavior on the dyno versus the controller’s capabilities, suggesting it changes how the system responds under load.

On a dyno, “load” is the resistance the dyno applies to the drivetrain to simulate driving conditions. The speaker describes how the engine response changes when the dyno applies load, affecting throttle control and tuning behavior.

To “bog” means the engine loses momentum or power and feels like it’s struggling to accelerate. In tuning discussions, bogging often points to issues like insufficient fuel/boost response, incorrect throttle mapping, or turbo lag under load.

“Spool jet” likely refers to a nitrous/boost control adjustment (a jet or nozzle setting) intended to help the turbo “spool” faster by changing how quickly the system adds power/pressure. The speaker’s description suggests it’s tuned in steps to reduce bog and improve response.

Lobe design refers to the shape of the camshaft’s lobes that determine how quickly and how far valves open (the ramp profile). More aggressive ramps can increase stress on the valve train, while gentler or better-shaped lobes can improve stability under high cylinder pressure.

The valve train is the set of parts that open and close the valves (including cam, lifters/rockers, pushrods, and springs). When cylinder pressure is extremely high, the valve train can become unstable—leading to bent pushrods or broken components.

A pushrod transfers motion from the cam/lifter area to the rocker arm that actuates the valve. Under extreme loads, pushrods can bend, which is a sign the valve train is being asked to do more than it can reliably handle.

Rod bolts are the fasteners that clamp the connecting rod caps to the connecting rods. In drag racing, high cylinder pressures can stretch or fatigue rod bolts, which can lead to catastrophic engine failure if they’re not strong enough for the build.

An exhaust valve is the engine valve that opens to let burned gases exit the cylinder. In high-performance builds, exhaust valves are often upgraded for better heat resistance and durability because they see the hottest conditions.

“Tulipping” (often called valve tuliping) is a failure mode where an exhaust valve face deforms like a tulip under extreme heat and load. It’s a common concern in high-performance engines because it can reduce sealing and lead to valve damage or failure.

An intake valve is the engine valve that opens to let the air/fuel mixture enter the cylinder. The speaker contrasts intake-valve construction and material choices with the exhaust valve, noting differences in strength and heat behavior.

“Inconel” is a nickel-based superalloy used for high-heat engine parts like exhaust valves. It’s known for retaining strength at extreme temperatures, which helps prevent valve failure during heavy towing, drag racing, or sled-pull-style loads.

In this context, “billet” refers to a component machined from a solid block of metal rather than cast. Builders use billet parts when they want tighter material consistency and potentially better strength for high-stress applications.

Exhaust flow is how much exhaust gas the engine can move out through the exhaust ports and valves. Higher exhaust flow generally helps the engine clear spent gases more effectively, which can improve turbo response and overall breathing under boost.

A dual spring setup uses two valve springs in series or tandem to increase spring stability and reduce the risk of valve float at high rpm. Builders often use it to improve valve control while managing weight and maintaining adequate force.

“Under boost” means the engine is running with increased intake pressure from a turbocharger or supercharger. That raises cylinder pressure and stresses valve sealing, so components like springs and valves must be sized and controlled for the higher loads.

“Horsepower” is an engineering measure of how much power an engine can produce. In this context, the hosts are saying that around 3,000 hp is becoming the competitive benchmark for UCC-level trucks.

A “cut tire setup” refers to modifying tires (often by cutting the tread) to change how they bite and shed heat during hard launches or pulls. It’s used to improve traction, but it can also make tires wear faster and behave differently as conditions change.

A “reverser” is a drivetrain control that allows the truck to reverse direction or change the effective direction of drive through the transmission/transfer system. In sled-pull setups, it can be part of how teams manage control and gearing for repeated pulls.

A “drop box” is a gearing unit (often a transfer-case-style reduction) that provides lower gearing for better torque multiplication. On high-power trucks, it helps control wheel speed and traction during pulls or launches.