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Old 08-21-2008, 10:19 AM
454C10 454C10 is offline
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I get 9.72:1cr.

785cc cylinder
72cc chamber
8cc head gasket
6cc reliefs
4cc deck height

(785+90/90)=9.7:1

you will be on the edge of detonation with 91 octane if the engine runs hot.

Yes, those manifolds are killing at least 75Hp. That could be a 400hp engine with headers and a performer rpm intake. You might consider adding bigger jets in the primary's and some richer rods in the secondary's.
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