gitsum

Are the heads for a 94 Z aluminum or cast? Are they the same heads that are on a 96 Z?

Kory 88 Iroc Lt-1

The heads on a 94 z are aluminum. They are usually thicker castings which are better for porting. I believe that the casting number is either 643 or 374. These would be the best heads for max porting.
Hope this helps.
Kory

shoebox

They are both. Cast aluminum.

No, as already mentioned.

gitsum

Thanks. Thats exactly what I wanted to hear.