A2 Grind CamCam bolts into 66 84 (except 80 81) Big Twin engines with no head work; on 80 81 engines the height of the stock H D valve guides restricts spring travel (and cam lift) to . 430" or less. Spring travel and clearance, plus clearance at main bearing boss must be checked on 80 and later models. More mid range and high end power; idle unaffected.
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