My 572 hemi is 11:1 and no issues at all on pump 93. Been 9.54 at 140.4 mph at 3800 lbs naturally aspirated on pump gas. Dwayne Porter spec'd Comp Cams solid roller 276°/284° @ .050", .672"/.651" lift, 112 LSA Mild lobes w/ light springs (PAC 1243) and good lifters (Isky Red Zones)
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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