If you follow the Corvette at all, you know the big block is part of its history. The 427s and 454s that powered the C2 and C3 cars are some of the most celebrated engines Chevy ever built. But that was a different era. The modern, mid-engine C8 was never designed around a big block, and Chevy will sell you everything but one, from the small-block V8s to the wild Z06, the electrified E-Ray, and the turbocharged ZR1 at the top. A torquey 8.1-liter brute? That was never on the menu, and it never will be.
Larry Hofer decided that was a problem worth fixing, so the guy from Raylar Engineering went ahead and built it himself. Three and a half years later, his 8.1-liter direct-injected big block C8 is running, driving, and actually racking up miles on the road. Greg Quirin caught the latest progress on his YouTube channel, taking the car (now about 95% done) out for a freeway run.
It Actually Drives Like a Car Now
This is the part that matters, and it’s a huge jump from where things were. No check engine light. The motor pulls clean, and once you’re up to speed the thing is quiet. Really quiet. It’ll sit at 85 mph without any fuss, which is not what you expect from a homebuilt big-block swap. Still some bugs to sort out. A sensor is convinced the frunk is open and won’t stop chiming about it, even though it’s latched shut.
The scan tool also picked up misfires on cylinders one and seven, dozens of them in one logged stretch, though you couldn’t really feel them through the throttle. Bumping the fuel mixture richer (135 instead of 147) cleaned most of that up. The catch is the engine’s basically living in fuel enrichment right now, and Hofer would rather it not.
Next Up: Eight Individual Throttle Bodies
Car runs, so naturally he’s already onto the next thing. The plan is a custom intake manifold with eight individual throttle bodies. Partly for the noise, partly because it’ll look insane. Nothing about it comes off a shelf. They took a factory C8 throttle body, cut it down, kept the pivot so the shaft stayed put, then borrowed a bracket off a $1,500 unit just to get the drive-by-wire electronics to play along.
It steps open about 10% at a time. Tuning is where it gets ugly. With that many throttle plates, nudging the pedal 10% can send idle from around 700 rpm straight to 5,000. Getting the tip-in smooth and the idle to settle is the whole job from here.
Why It Matters
There was no blueprint for any of this. No kit, no forum thread, nobody who’d done it before to copy. Every piece of it, the engine management, the throttle control, the intake, had to be figured out from scratch. So the misfires and the phantom frunk alarm aren’t the car falling apart. They’re the kind of small stuff you chase right before a build is finished. Three years on, the world’s first 8.1-liter big block C8 isn’t a crazy idea sitting on a shop floor anymore. It drives. Hofer reckons the next update is two or three weeks out.
