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The 11.5:1 compression ratio would be a concern for a street car not running high octane race fuel - that is on the outer limits, even with twin plugging, for air cooled cylinder heads. Guess it would be safe enough if ignition timing is able to be pulled back at higher RPMs (I didn't read about what it has for ignition or engine management), but even with the ability to do that, cylinder head temps will be higher, and likely lead to less life out of the valve guides. Something for a potential buyer to consider, I suppose . . .
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