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Hey guys! For better or worse I'm moving from my 400sbc to a gen V 454 I plan to stoke to a 489(or there abouts).

with my 400 I could afford aluminum heads off the back so I ran 9.3:1 compression with 10 pounds of boost on a intercooled centrifugal no problem.

I don't have the casting numbers off these heads handy but what I wanted to know was what compression could I make to only make 4-5psi as I would like to upgrade to aluminum heads eventually and run closer to 10psi. OH BTW this is a pump gas application haha that's a biggy almost forgot to mention.

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