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Old 01-21-2013, 01:25 AM
cadillacdave1 cadillacdave1 is offline
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Sorry, I mistyped but it is a 389. These were high compression motors. If it is a flat to[p piston check how deep it sits in the hole, cc the chamber and that should give you an idea of the compression. Otherwise the listed factory compression is a starting point. You can work backward and determine if you raised or lowered the compression if you look up what size chambers the factory heads were.
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