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Going to a 0.040 head gasket with stock, unmilled 241 casting heads (67cc) would only bump your SCR from 10.38:1 to 10.68:1. I dont want to mislead you with the 11.4:1 SCR I posted earlier with my milled heads (62cc, 0.040 gasket).
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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