[Formulajones]

Originally Posted by Will

I don't know what they'll support in stock form, but when ported they'll easily support 500+ horses.

Well I know for a fact they'll at least support 507 HP in stock form.

I just did this on a 455 not long ago. 9.98:1 compression pump gas, ported iron 7F6 HO round port heads, a 239 @ .050 hydraulic roller, stock aluminum HO intake with heat cross over intact, and a stock Q-jet that I modified with Cliff's kit. And I did that with the factory iron exhaust manifolds in place with it's stock points distributor.