I have heard the 100LL is rated differently and is higher than 100 octane, but no one could tell me what it actually is.
FWIW...I have an old friend that ran a 468" BBC that was 13:1 w/ 2 stages of nitrous for YEARS on nothing but 100LL w/ no trouble.
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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