Quote:

Quote:

o deck with a flat top piston will be too much compression for pump gas 91 octane, will need to be around 9.2:1 J heads with 2.02 valves



I built 1 for a friend and it is 10.3-1 with aluminum heads and is doing fine on 91

You really need to know the chamber size of the heads you are going to use before you know for sure what your final comp ratio will be.

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