Quote:
Originally Posted by Don Kennedy
Correct
the correct part number and casting number for the NHRA-approved Pontiac head part number is 60587, and the casting number is 6058. The casting number is inside the valve cover near the middle head bolt 6058
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I was just teasing you.
I've always liked your car and followed GT/EA (GT/AA) pretty closely for years.
The good news is that from what I can tell they're looking to get the head approved presumably with an NHRA casting number.
My point was, if the valves, ports and chambers are correct after porting, what possible reason could there be to not approve it?
Admittedly, a thicker casting could be used to create a much better port shape. But, that could also be achieved with grinding and filler rod in an approved head.
I have no investment in this argument. I genuinely couldn't care less. It just seems to me that a porter's casting could alleviate a lot of headaches and actually cost less to port in the long run.
I also see the other side of the argument, in that it could lead to an argument for billet heads down the road, which would go beyond what many consider a class that has already gone way too far.