Re: 1966 427/ 390
A catalog can only give a ballpark CR value. It's highly dependent on deck clearance, which should be measured prior to disassembling the block. Then different piston and head gasket combinations can be tried to achieve close to the target CR, and one should always pay attention to piston compression height as replacement pistons may be different than OE, which will alter the value of measured deck clearance at disassembly by the difference in compression height.
The attached paper explains the procedure.
Duke
A catalog can only give a ballpark CR value. It's highly dependent on deck clearance, which should be measured prior to disassembling the block. Then different piston and head gasket combinations can be tried to achieve close to the target CR, and one should always pay attention to piston compression height as replacement pistons may be different than OE, which will alter the value of measured deck clearance at disassembly by the difference in compression height.
The attached paper explains the procedure.
Duke
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