Pat on the one time thing does that mean they didn't perform good? I thihk they have 194cc runners and 2.08 intake and 1.60 exhaust, These heads were on a round track car and they had a rule change so off they came and don't if they had any work done to them. I haven't seen the heads personally yet but my other engine builder knows where they are at and he say's he'll check them out first.