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The engine can't do over 4,500RPM. I'm some what afraid to go any higher with the compression ratio. According to any VW guru, I'm nuts for having more than a 7.5:1 CR. (This is what all your typical air-cooled VWs have become thanks to all those VW gurus, 7.5:1 CR or less (one of them recommends 6.5:1 or less) with a 13:1 AFR or richer across the board along with a mechanical advance distributor.) I think I can pull off a 9.5:1 CR. If I can control pinging good enough at that CR I might take the heads off and have them fly cut a little more than what I've cut them so far (on air cooled VWs you fly cut them to raise CR).
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