02-22-2022, 11:58 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,646
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Not Ranked
I think current Pro-Mod Rules use 4.500" as the bore spacing line of demarcation between small block engines and big block engines.
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