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Thanks for the reply. It is a AMC 258. Cylinder head casting is 8933000. The only number I could find on block is 6045037. Looks like it was stamped on, so probably not a casting number.

Trying to resurrect my 86 cj7. Bought a rebuilt cylinder head, already returned my original. Tried to bolt it on and the cylinder head bolt holes are too small. Block has 1/2 inch bolts. Cylinder head has holes for 7/16. Can someone tell me, what size the hole was from the factory? Going...