Help with 70 Z28

[ronzz572]

Originally Posted by Lynn

I think they are right on the money. That forging number is not the part number.

Just like 186 sbc heads; all 186 heads have the same casting number, but they may be different part numbers depending on whether they came with 1.94 intake valves or 2.02 intake valves. They start as the same casting but are machined differently.

I had a couple of pitman arms with the same forging numbers; but two different size holes for mounting to the pitman shaft.

I'm going to agree with Lynn here. There should be 4 different Pittman arms that share the same casting numbers. 2 Longer arm for Z28 specific 1 manual steering 1 power steering. And 1 shorter manual 1 shorter power steering for standard non z28 cars. All should have the 881 casting. Identifying them will require measuring them. I see no other way to identify them presently.