Sounds like a beast of an engine for what i assume is a street car. Nice work. BTW i took my guesses from Jim Hands book on "How to build max performance Pontiac V-8"s" he has a dyno graph of a 473ci, 10:1 comp, 255cfm, witha Comp Cams XE294. I know your heads flow 330cfm so that had me thinking I'd be a little off but hey, pretty close. Can i ask what price range Butler is selling these for? Last I checked with Tin Indian a few years back they wanted upwards of $10K for a performance 455 build with 500hp, 550ft-lb with me supplying the 455.
Last edited by clevelandpartsguy; 07-13-2017 at 04:30 PM.
Reason: added hp numbers