flywheel question

[Bigblock514]

This is a 460 flywheel can anyone tell if it's for external or internal balanced big blocks? Its from a super duty f350 w/460 going on a 460 from a 69 Lincoln mark III w/460.

[tnlprt]

1979 & later 460's were externally balanced, while the 1978 & earlier were internally balanced

[averagef250]

That is certainly external balance (see the big honkin balance weight cast in?). Probably from the early 80's with that old style 6 bolt pressure plate pattern.