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#21
02-26-2026, 06:13 AM
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It was proven way back in 1976 by HO racing ( I think it was 76) that the SD455 in the F body lost up to 90 hp thru the off the show room floor exhaust system.
If even back then you built a D ported headed 455 with the 744 cam and headers , along with a 2 1/4” exh system you where making more power the the show room floor SD.
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