074 Head Porter ID

[Chuck_Burg]

Hi guys. I recently picked up a beautiful pair of 074 heads dated 10.30.72. The heads don't seem to have any aluminum repairs, they're in really good shape. A friend of mine has had them for several years, he is an engine builder and took them in as a down payment for an engine build several years ago. The heads have been ported and it seems the shop left their mark, "AUTO. SPEC. 3.118". My buddy doesn't know who stamped them but the heads were on a "CAN-AM" car. He didn't port them, only assembled them and gave them a nice valve job. The heads flow 325cfm at .600 lift on the intake and 218cfm at .600 on the exhaust. Does anyone recognize that stamp?