[73T/A]

I purchased a set of 1971 455 H.O. cylinder heads casting 191 about 25 years ago.A individual was selling these heads and other parts for an acquaintance.These heads are essentially configured like 455-SD heads +.They have pushrod tubes and the valve cover bolts and rocker studs both are through the intake port roof.Combustion chamber size is 92cc that’s after I had hardened valve seats and new stainless valves installed.Chamber was most likely smaller than that before.Also during the purchase the seller then notified me that those heads were special and came out of Pontiac and were not supposed to be sold.I mentioned that I had already mailed the cashiers check a week ago.He then talked the owner into letting them go.These heads are stamped on the back of the head RUSS with looks like a work order number 10750 this is on both heads same location.On the front of the heads are the number 2 stamped four times almost in a rotating cross pattern.Russ Gee was one on engineers on the SD 455 and was also head of the Pontiac Dyno rooms maybe RUSS stamp?And the number 2 stamps may represent Pontiac motor division which Pontiac used on VIN’s etc as a identifier.Or all this could just be a head porters stamps.What do you think?