Re: I don’t understand.... Harmonic balance, flywheel
The bolt holes for the flywheel/flexplate in the crank are arranged so that it will only go on one way. Same with the balancer and keyway. This is referred to as external balancing.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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