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If both dots are at 12 o'clock and the rotor is pointed at #1 you're in good shape. Dot-to-dot (crank dot at 12 and cam dot at 6) would actually...
Another one that works good is Valve-Medic.
Did they put 8 3/4 in full size trucks in 91?? Should be a 9 1/4, shouldn't it?? Or have I bumped my coconut again?