I'm hoping it was a change for the better, but that still remains to be seen. It definitely pulls better above 6200 though. The GT-40 just didn't have enough margin to cover the heads for what I'm doing.
If the original poster is still interested in regular GT-40 irons, I've got someone who's selling a set of bare castings. They were run on the dyno once, but then the guy opted for GT-40P's instead (he's an SCCA A-Sedan racer). Contact me through email if you're interested.
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Jeff Chambers
T/S #3
11.611 Seconds/116.7 MPH
Chambers Racing Team