Join Date: Aug 1998
Location: Waldorf Md. USA
Re: 396 Engine build
Before you get too deep into pistons, have you actually had the heads cc'd to verify the chamber size ? I have seen stock heads vary quite a bit from published specs.
I would pay the extra to get a piston made rather than mill the heads that much. You will probably have to cut them .060 or so. Then you have to mess with the intake not fitting and either milling the manifold or the intake surface on the heads to match. By the time you do all that you will probably spend more than the difference in the piston price between a shelf piston and one that is exactly what you want. Not sure what machine shop charges are where you are located but I get a minimum of $180 to mill an intake manifold.
I would personally stick with no more than 9.5 to 1 if you really want to run 91 octane.
Advanced Automotive Machine
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1971 Heavy Chevy - original owner
1984 Buick Riviera - original owner (Wife's car)
Team Chevelle #100