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if you mean regular street gas i would put it together with the #66 heads with felpro gaskets. this would give an as stock configuration so pump gas would be fine. factory had flat tops . i had raced it #48 heads (65cc due to mill) and .027 cometic gaskets. that gave 12.9 to 1 compression so race gas would be necessary. i used alcohol but race gas would of been fine. the #48 heads are basically new with only 7 runs on them until bearings spun. the good nodular crank needs polishing as it has some surface rust that comes off with crc so i dont think it would need a major cut. maybe .010 /.010 but that is usually what you get with any used standard crank and even some aftermarket need cut to get the proper clearances. if you had 72cc heads you would get around 11 to 1. i dont have any 72 cc heads left. i dont know what cc the #66 heads are but are untouched and would need some minor work.
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Zac Carr
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