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Mustang GTD rumored Nurburgring record time, Hyundai Boulder Concept and Chevy’s new LS6 engine

Mustang GTD rumored Nurburgring record time, Hyundai Boulder Concept and Chevy’s new LS6 engine

CarCast Apr 02, 2026 55 min
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About this episode

The crew runs through big auto-show and performance rumors: Hyundai’s Boulder concept leans into the off-road trend with 37-inch tires and a mechanical-looking interior, while Ford’s Jim Farley keeps pushing racing and off-road credibility. The conversation then shifts to GM’s new LS6 pushrod V8—6.7 liters, 13:1 compression, 535 hp/520 lb-ft, and the intriguing question of whether it’s crate-engine and boost-friendly. They also debate Ford GTD Nürburgring record chatter, possible Whipple upgrades, and whether Ford will sell an upfit package. Finally, they talk project-truck manual swaps, brake weak links, ethanol fuel policy, and a charity cookout at Goldberg’s garage.

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Technical Too Afraid to Ask
Car

Ford F-150 Lightning

"Get on the 95 Ford Lightning, haven't taken that out in a little bit and wanted to get it cleaned up and fired up... Something about that truck, it's just like every time I take it out... is that a Lightning"

The Ford Lightning is a special version of the Ford F-150 truck. People like it because it’s a faster, more exciting pickup than a regular one. Here, they’re just getting theirs running and adding parts.

Car

F-150 Raptor

"... is like off-road is the thing these days. Every Raptor kind of started it like 15 years ago or sort of b..."

The Ford F-150 is a large pickup truck. The podcast is saying that off-road capability is a big trend right now. It brings up the F-150 because it’s the base for off-road versions that many people want.

Term

adventure trim

"Ram with TRX and every SUV that's out there has some sort of adventure trim, right? Like a Honda or a Mazda CX-5 has a CX-50 and it doesn't even necessarily mean there's a lot of new components for it."

An “adventure trim” is a version of a regular SUV that’s styled to look more outdoorsy. Sometimes it’s more than looks, but sometimes it’s mostly trim and a few changes like tires.

Term

37s

"It's big truck, off-road capability, big tires, maybe 37s."

“37s” refers to 37-inch tires, a common shorthand in off-road circles for very large tires. Larger tires help with ground clearance and obstacle clearance, and they’re often used to signal serious off-road intent.

Car

Hyundai Boulder

"We've got a Hyundai getting into the game. They showed this vehicle called Boulder."

Hyundai’s Boulder is a concept truck/SUV shown at the auto show. It’s meant to look and feel more like an off-road adventure vehicle.

Brand

Pagani

"Not full on like Pagani, but you know. It's cool for the automaker that they are to come out with that thing."

Pagani is a luxury supercar brand famous for very fancy, detailed interiors. The comparison is basically saying the design is aiming for that kind of premium, mechanical look.

Term

concept

"Yes. They have it as a concept at least. I mean, it's cool."

A concept car is like a preview of what a company might build next. It’s not always the final product you’ll be able to buy.

Car

Mercedes S-Class

"I just drove the Genesis G90 sedan to Vegas and back in, you know, for 105 grand for probably $30,000 less than a Mercedes S class. It was like super competitive."

The Mercedes S-Class is one of the most prestigious luxury sedans. The host is comparing Genesis’s flagship to it to show how competitive the pricing felt.

Concept

going off road

"But I post COVID there's been a lot more adventures going off the grid going off road than anything. [439.3s] Yeah, than anything else."

“Going off road” means driving on dirt trails or rough ground instead of regular paved roads. They’re talking about whether more people are actually doing that now.

Term

EV

"You know, you're an EV. A person going to buy an electric Cayenne is not taking it off road."

EV stands for electric vehicle. In this context, the speaker is arguing that because it’s an EV, buyers are less likely to take it off-road, implying different usage patterns than traditional off-road vehicles.

Term

manual transmission

"Obviously, nothing is manual transmission anymore. So to take the older one that you've got like it's kind of like it's still modern enough."

A manual transmission is the kind where you shift gears yourself using a clutch pedal and a stick. The speaker is saying that manuals are rare now, so building a truck with one is a big part of what makes it different.

Concept

engine swap

"It's like every time we start looking at a project and going, all right, this is the engine swap we're going to do. Then you got to start thinking of all the weak links between."

An engine swap is replacing a vehicle’s original engine with a different one, often from another model or generation. The speaker notes that once you decide on the engine swap, you must also plan for “weak links” that can fail under the new power and torque.

Term

rear end

"You got to look at the rear end, how much of the rear end is built. Yes."

“Rear end” is shorthand for the rear axle assembly, including the differential and axle shafts. The speaker is emphasizing that you need to evaluate how much of the rear end is built/strengthened before adding more power.

Part

braided brake lines

"it's easy to do the brakes and have the brakes have braided brake lines, have braided lines, right? [853.7s] It comes right off of the stainless line and goes to a braided line."

Braided brake lines are upgraded brake hoses. They flex less when you press the pedal, so the brakes feel firmer and respond more consistently. That can make a big difference on performance driving.

Part

rubber brake line

"But on that car, as an example, there is a rubber brake line that goes down kind of like the middle where the drive shaft is. [872.0s] Yeah."

Even with upgraded lines, some cars still use a rubber brake hose section. Rubber can stretch a bit when you brake, which can make the pedal feel softer. The goal is to minimize the parts that flex.

Concept

dyno

"[1014.5s] You either do it on the test track, the dyno or in real life situations. [1018.6s] And I'm, I'm not for the latter of those choices. [1022.1s] Yeah."

A dyno (dynamometer) is a machine that measures engine power and torque while the car is stationary. It’s useful for controlled testing because you can repeat runs and isolate variables without real-world traffic conditions.

Company

SEMA

"when we spoke at SEMA, they don't have the electronics to, to equip it to a more conventional push rod engine."

SEMA is a big annual auto show focused on performance parts and custom builds. People go there to show new tech—like transmissions, wiring, and engine management systems.

Term

all wheel drive

"So the e-ray is the hybrid version with the electric motors all wheel drive."

All-wheel drive means the car can send power to more than just the rear wheels. That usually helps the car hook up better when you accelerate.

Concept

horsepower

"And if you want that, so I think it's like 535 horsepower for one car and 700 plus horsepower for the, for the X version."

Horsepower is basically how strong the engine is. More horsepower usually means the car can accelerate harder, especially when paired with the right drivetrain.

Company

GM

"This new engine is a big deal for, for GM because this is going to be the new Pushrod V8 in their lineup across several vehicles, possibly SUVs and trucks as well."

GM is short for General Motors, the big car company. They’re saying this new engine could be used in a bunch of different GM vehicles.

Term

forged internals

"It's got forged internals already from the factory. It's got a bigger, I think it's like 90 or 95, 95 millimeter throttle body."

Forged internals mean key engine parts are made stronger than standard cast parts. That can help the engine survive harder driving or upgrades.

Term

compression ratio

"Now the interesting thing here is the compression. To get this power, they're doing 13 to 1 compression ratio."

Compression ratio is how tightly the engine squeezes the air-fuel mixture. Higher numbers can make more power, but they can also make the engine more prone to pinging if you add boost.

Term

direct injection

"Now what's also kind of interesting is we had port injection for a while and then we had direct injection. And then on this new engine, it's going to have both the port injection and direct injection."

Direct injection means the fuel is sprayed straight into the engine’s cylinders. It can be efficient, but it can make tuning for boost more complicated.

Part

Whipple Supercharger

"Now, the way I understand it, looking at spy photos from before, this has the Whipple Supercharger upgrade, right? I'm presumably at least a three-liter Whipple on it, so making probably closer to 1,000 horsepower."

A Whipple supercharger is a device that forces more air into the engine. More air usually means more power, but it has to be set up correctly so the engine can handle it.

Concept

limited production

"But the GTD was sold as a limited production, high performance car. And there was never any hint of a more extreme variant available at some point."

“Limited production” means only a small number of cars are made. That usually makes the car more exclusive, and it can influence whether the company later offers even wilder versions.

Part

carbon fiber body

"The design is really cool, I believe. And it's carbon fiber body and it just had like a lot of GM parts, bin, plastic-y things"

Carbon fiber is a strong, lightweight material. The speaker is pointing out that the car had a carbon fiber body, which sounds premium, even if other parts didn’t match that level.

Term

aero

"[2375.0s] It's all about the suspension, the wide body, the aero. [2378.8s] That's going to make all the difference in the world."

Aero (aerodynamics) refers to how air flows around the car, affecting drag and downforce. The host argues that aero differences are a major reason the GTD can be fast around a track, even if the engine family is similar.

Concept

wrapped

"Right when he got it, he had it wrapped that he drove it to Monterey car week. He just drove it right up there, which is pretty cool."

A “wrap” is a vinyl film put over the car’s paint. People use it to protect the paint or change the look for a while.

Term

bump stops

"Like you could drive that thing and it's like my truck right now beats me up more because it's lowered and sits on the bump stops."

Bump stops are like the suspension’s “last stop” when the car goes over a big bump. If you hit them often, the ride becomes rough and jarring.

Term

E 15

"...the EPA... is asking... of of of E 15. Now, it's definitely parts of the country... We have that 88 octane that E 15, but a lot of places have the E 10."

E15 is regular gas mixed with a certain amount of alcohol (ethanol). Because it has more ethanol than normal gas, some cars may get slightly worse mileage.

Term

throttle

"Now granted, when I step on the throttle in that car, I can watch the, the gauge move a little bit. Right. Um, it's, it's burns quicker."

The throttle is the pedal that tells the engine how hard to work. When you press it, the engine burns more fuel faster.

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