333 heads castings

[dunhamfield]

I have two different sets of 333 casting heads. They both have one head that has a GM2 casting and the other a GM4 casting.
My question is should I match up the same GM castings together or is there a reason for the two different castings?
Another question would be is there any difference between the two castings?
Thanks Guys

 

[62sedan]

The difference only equates to the mold number that the foundry used to cast the heads. Other than that, they should be completely identical.

If it were me, I'd use a matched set on my engine.

 

[jester]

The difference only equates to the mold number that the foundry used to cast the heads. Other than that, they should be completely identical.

If it were me, I'd use a matched set on my engine.

Use what you have, there is nothing wrong with what you are planing to do. To stop a build because the heads didn't come from the same mold is crazy. There I said it..