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Old 09-29-2012, 11:32 AM
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Thumpin455 Thumpin455 is offline
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Yep, need to know what heads and pistons you are running to get 9.5:1. The differences in heads that will fit a 389/400 can make it ping or run on easily. Can you tell us what the number is cast into the center exhaust ports, if there is one there? Need to start somewhere, might as well be with the combination you have.
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