Anyone ever run Speedmaster Heads on their small blocks

And, how did ya do at the track?
75Sport said
I have a set on my 421 small block. I ordered bare but CNC ported. Machinest installed 2.055 & 1.60 and stated they were as good as any and better than most. Only flaw was on two of the ports the CNC cut into the valve cover screw holes.
Dan
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