Need help guys, engine gurus PLEASE!

[Chevy454]

Nope, that was the only variation from an "as delivered" L-72...I wanted to see exactly what someone would have gotten had they ordered an L-72 car back in '69. Instead of the .018"-.020" shim I used the .038" Fel-Pro composite, but did take a bit off the heads. The heads were around a 112cc average (I believe they're supposed to be 107cc), the piston domes (TRW) were around 28cc (supposed to be 34cc), and the slugs were somewhere around .015" in the hole (can't remember that spec exactly). Not exactly the specs I expected to find!

But, that engine still hit 425hp on the engine dyno through stock exhaust manifolds/head pipes with the factory L-72 cam, and pushed our 3800lb. Camaro to a 12.79@108+, all on Polyglass tires...and it was bracket car consistent to boot.

We blue-printed our latest L-72 and picked up about 55hp at the flywheel...