Join Date: Nov 2009
Location: Toronto, Canada
Is a 90mm TB a restriction? Only if the heads and cam and exhaust ALL outflow the TB . Your tuner will be able to tell you by the peak MAF signals. If the engine doesn't outflow the intake and MAF system then the TB is not a problem.
From Accufab site a 90mm – 1369cfm. From F.A.S.T. on a 427 cu with ported heads made 11 more HP over the 90mm TB
'09 PBM GT. #2 "Time to start modding again"