The cranking pressure won't tell you much. I have an aluminum head 11:1 hemi that cranks 185 psi and runs on pump gas w/ 34°. Also have an aluminum head 14.5:1 wedge that cranks 185 psi and needs 112 fuel. The same motor w/ a different camshaft cranked 275 psi and also ran 112 fuel. Both run at 38°.
Had an iron head 12:1 440 years ago that cranked 220 psi and needed 110 fuel at 38°.
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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