the guy who did the heads when my dad still had the car ovaled the exhaust ports out like a putz,the guy who just did my heads is friends with mondello from WAYY back and told me that the heads are pretty damn worthless seeing as he ovaled the exhaust port out and cut the port floor out of the exhaust. he said NEVER oval them out and cut the floor. he told me he would of enlarged the exhaust yes but, without cutting the port floor out <notice they make raised runner heads> and make them d port. he also said that with it being ovaled with no floor there is barley any scavenging effect on the exhaust.