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Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
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"You can use JE pistons at 9.5:1 or so with single plug, "
as a data point - i used 10.5:1 JE's and had no det'n problems with our (ie. aussie) premium fuel (nb: GE80 cams). however, the engine runs much much better (particularly under 4000 rpm) now we've converted it to twin plug.
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Cheers, Ryan
1969 911E (historic racer)
911ST replica (tarmac rally)
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