[427king]

I believe the triangle stamp on the end of one head meant that that particular head came on a motor assembly and was not bought over the counter in boxes .For some reason the 392 heads but not 842s followed this rule.At least that theory has held true for 4 or 5 motors that i have that were known original assemblys[1 real L88, 1 real L89, and 3 OTC assemblies that were never taken apart.that is a good pool of engines i believe based on production of L88s at 20 and L89s at 16]],you dont usually find unassemebled 67 L88 or L89s with known factory installed heads anymore so finding any more examples is very difficult. I also have 3 sets of NOS 1967 392s and none have the triangle,which may further serve as proof.