1970 vs 1976 Cad500 crankshaft

Big Cadoo!

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What vehicle(s) do you drive?
Allegro
Heres pictures of difference in 70 vs 76 year crankshafts. The #4 rod throw is hollow with a through hole on the 70 year crankshaft. On the 76 year crankshaft the hole is not through. The counterweights on front and rear of 76 year crankshaft are scalloped towards center of crankshaft. The thrust section is wider on the 70 year crankshaft. The thrust bearing width is the same dimension.
 

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