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I have a 460 that came out of a 78 camper special it had a auto tranny in it and I want to put it in my 77 highboy and i dont know what flywheel to put in it is it an internaly ballanced or externally ballanced motor?
Yeah, one way you can determine if its external or internal is the weight on the front of the crankshaft behind the harmonic balancer. There should be a Hatchet shaped weight for externally balanced 460.
there is another way to tell if it is internally balanced. look for numbers on the crankshaft. 2ya , 2yab, 2yabc. those are internal external numbers are 3ya , 3yab, 3yabc.