100 oct. LT4, 10.5:1 CR., 5400 ft. elevation; Callies/Callies/Diamond, etc., top ring gap is .023", 2nd ring gap is .025"
Quote:
Originally Posted by Eldi Z
Guess you are talking about Pump gas E10 and I guess on an LT4 ?
Forged material + lower C/R allows for a leaner mixture.
The LT1 with its cast pistons and tight ring gaps is likely less forgiving, so a little richer for safety and yes I saw some calibrators feeling comfortable even with 0.86-0.87 and then are usually more careful with spark advance and boost.
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2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO.
15" conversion, MT ET Street R 325/15.
100 octane: 1045hp/1055tq.
100 octane + Meth (1x10+): 1117 hp/1067 tq
Last edited by JSH; 10-14-2025 at 11:24 AM.
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