You can also run Chevy style plug wires with the 90* boots to clear the headers too.
Quote:
Originally Posted by 86GTPONY
Also - they bump your compression up from 9.0-1 to 9.5-1...if I recall correctly. Premium pump gas runs fine...
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I don't know about the CR on P heads,but I had my GT40's milled down .030" to 60 cc's which put me at 9.8:1 CR. I run 93,with no detonation,and base timing @ 18*.
