If this is a request, Ill quit. If this is a "warning" ill continue.

Sometimes you get more bees with honey then you do with vinegar.

 

No, you won't continue and we don't care for the rebellious attitude to this site's rules and policies. You have no reason to be such a hard-*** about this.

Are you interested in buying what is for sale or not? If not, you had no business posting in this thread in the first place. If so, badgering the guy in such a rude manner is not necessary and is not impressive in the least.

The way you posted in this thread contradicts that. Perhaps you should try being a bit more polite when asking for information.

 

Will, you should be ashamed to call yourself a Marine. I would assume these are GMPP heads, P/N 12363287: Description as follows.

This aluminum LT4 head is the same as the 1996 production head except it has the LT1 rocker stud P/N 12552126 installed. This head has light weight 2.00" intake and 1.55" exhaust valves installed in this assembly. These heads can only be used on 1992 and later LT1 and LT4 engines. Casting P/N 12555690.

Technical Notes: This head assembly includes the following items, intake valve P/N 12555331, exhaust valve P/N 12551313, valve spring P/N 12551483, valve cap P/N 10212808, seal P/N 10212810, key P/N 24503856, stud P/N 12552126, and shim P/N 10212809.


I could be wrong and these could be different heads...but true LT4 heads would come from GM...so there's no need to be looking at AFR part numbers.