Originally Posted By moparx
can an aluminum head [pocket ported eddy performer rpm] with an 11.0:1 CR be ran with 93 pump gas [with adding ?? amount of race gas or additive] in a 4000lb charger, MP590 cam, 3.91gear by backing timing down to around 18[or so] initial, 32-34 total, without detonation ?
i know this is on the ragged edge, but just asking.
how much will this affect performance ?
a head gasket change can [i think] lower the CR to around 10.5:1 or so.
other suggestions ?
TIA up
beer


I ran an 11.25:1 Stage VI headed (very worked) 440-6 on the street w/ 93 w/o issue. I did have a Meth/H2O injection kit for the track. Much cheaper than mixing gas. I had the timing at 37* all in at 2400. car was a 70 charger 3800+lbs 3800 stall 3.91's went 11.28@121

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