I have 2 sets of heads, one set has AX2 and the other set has A1 or AX1 casting numbers, what is the difference in these heads? Marvin
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I have 2 sets of heads, one set has AX2 and the other set has A1 or AX1 casting numbers, what is the difference in these heads? Marvin
What are the casting numbers???? Those numbers mean little or nothing.
Buick casting numbers are typically 7 digits, sometimes 6, sometimes more.
you're not going to see the Buick casting number unless you pull the valve cover off.
Big Block casting numbers are here:
https://www.teambuick.com/reference/..._big_block.php
AX2 and A1 sound like two / three digit engine stamping codes and are actually on the exposed face of the block between the #1 and #3 spark plugs. i don't recognize "AX" as a valid Buick stamping though.
https://www.teambuick.com/reference/...gine_63-75.php
how many cylinders are these heads for? v6 or v8?
Actually, the Nailhead casting numbers are on the outside of the head on the exhaust side.