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Old 09-01-2008, 10:23 AM
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vortec heads on a 406, can it be done on pump gas?

i have a 406 with forged flat top pistons that i was going to put a set of afr 195 cc heads on with 75cc chambers. i'm selling the afr heads because i need cash to finish my garage, so now i need a set of heads. i have a set of 906 vortec heads, but they are 64cc chambers. i'm figuring 11.52, this is how i'm figuring it.

4.155 bore
3.75 stroke
4.200 gasket bore
.040 gasket thickness
5cc valve reliefs in the pistons (could be more or less)
.005 deck height.

is this to much for 93 octane? i'm thinking of a cam in the lines of 240-250 @.050 with anywhere from a 106 - 110 lobe separation.
the heads being cast iron is what worries me. aluminum would probably work, but i don't know about cast iron.
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