Quote:
Originally Posted by rotorwrench
If it has bulges on each side of the pan rail with core plugs then it is early 39/40 type. If it has no core plugs on the pan rail and has a raised appearance on the intake deck then it would be 41/42 type.
If it has the 29A con rods then it is a direct interchange for rotating assemblies with the 59 series. The 59 stuff will fit it though as long as you use all the right parts. The only real difference then would be that it has thicker cylinder walls and the earlier type valve angles.
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Thanks. It has the raised intake deck and the rotating assy was swapped out of a 59 block. The valve angle shouldn't matter on the thicker block, should it?