engine size autocross

[c3rocket]

I do agree with the torque curve on the 427 I am in first gear the whole time at good guys autocross and 1st and second at another venue but with that much power I could stay in second the whole time and even lug it a bit in the turns barely throttle my little 350 I have to rev the piss out of it its gutless.

[c3rocket]

This is my other ride and it is machine in a half and I like the power curve in it and I think it would do well in autocross .

[short&wide65]

Those are both great looking Corvettes! I have a strong want for a 70-72 Corvette that I could autocross. Seeing yours isn't helping. lol. I had to pass on a cheap local red on red 72 last summer with a non numbers matching 350 and a bad rear subframe. The perfect project. But I have 65 GMC I have to finish first.

Also one hint (granted I'm no expert so hopefully more will jump in) since Autocross tracks are pretty short, I think a broad and flat torque curve works best. You'll mostly be using a couple gears if you have it setup right. Broader minimizes the gear changes as you setup transitioning from corner to corner (big savings in time and keeps the tire loading changes less abrupt). And flatter keeps the power very predictable for the driver regardless of the track.

So just looking at the Blueprint engines, the 427 seems to have power that is both slightly wider and a little more flat than the 454. With the torque it puts out, you could throttle out of a corner at 2600rpm and go up to 6200rpm without shifting if you needed to.

I'm not sure if a de-stroked would be preferred or not. It'll rev faster, but you'll want steep gearing to make it strong coming off a corner, and then really spin it up before the next corner.

I do agree with the torque curve on the 427 I am in first gear the whole time at good guys autocross and 1st and second at another venue but with that much power I could stay in second the whole time and even lug it a bit in the turns barely throttle my little 350 I have to rev the piss out of it its gutless.

In my opinion (I'm no expert either) I would want a destroked engine because any of the cars I've co-driven at autocross with a flat torque curve overwhelm the rear tires coming out of corner too easily. Moving the powerband up makes it easier to get on the power sooner.