greenfoam
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^^ That's right you wont make 300 without good heads on it. 270-280 more like it for the original poster. Depending on how good the exhaust really is etc. 300 is a very good number for a LS1 not many really make it there messured on realistic dynos. I know a guy with a high 11 second VY manual and hes making 290 rwkw with a better setup than this (dart heads etc)