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Old 12-14-2011, 05:37 AM
454C10 454C10 is offline
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what gear ratio?

you can change to a thinner head gasket but that will not help much.

To make a differenece, either change to a smaller combustion chamber head or get some pistons with a small dome. 820's heads have 110cc chambers (10cc less than the 781's).

Or, use the 8:1 cr to your advantage and add some force induction (turbos, super charger, blower, or n02).
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