Quote Originally Posted by frankgomez65
Whats the highest compresson i can run on pump gas, or with octane booster,
on a 383 chevy=
on a 350 chevy=
It all depends on the cam specs as more duration will bleed off compression due to overlap. You have to figure dynamic compression ratio rather than static compression. DCR of 8:1 is about maximum with iron heads and 8.5:1 with aluminum heads. DCR takes into consideration your cam specs and is a much more reliable guide to building an engine. For a very thorough explanation of DCR, go here: http://www.chevytalk.org/fusionbb/sh...php?tid/92966/.