[HWYSTR455]

Butler has a pump gas 535 that is 700hp x 700ftlbs:

https://butlerperformance.com/g-2128...-pump-gas.html

Over 541ci pretty sure you need a 4.75 stroke crank, which would be billet, and requires considerable machine work. Lead time on those cranks are like 2 years, too.

I know there are a couple on here that have done 571ci builds. Formulajones' dad's build is a 571.

You might be able to do a 555ci with a 4.50 crank, would take like a 4.43 bore, not sure the aftermarket blocks' max bore is. Pretty sure the IA2 goes to 4.35 bore, forget what the MR1 goes to.

535 should be plenty though, that's what I did, pretty sure I'm in that range (700x700), think I run a bigger grind than the Bulter 7x7 build.

Spotts guess-timated the build at @670hp with the 315cfm heads and am now at the 340cfm heads. He commented I would be easy over 700 with the 340 heads. It's pump gas and streetable, that's what I built it for. Have AC and power brakes.

What are you trying to do?


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