Thanks for the data UStik. What I'm primarily interested in is how the three ST's differ in power. This is problematic because of all the different versions of the Blue Head that Garofali produced. I have no idea whether the S.61 underwent changes during its production. I believe the S.61K remained the same during its lifetime. The BH that I have is one of the last versions; it has PDP porting, STS porting, a chrome sleeve and no baffle on the piston. It's probably one of the strongest BH's, too. Still, I would imagine the S.61 is stronger having Schneurle porting. But, is it stronger or weaker than the S.61K? At any rate, it looks to be a bit lighter (smaller head). I will tach my BH and S.61K with an APC 11x8 and a Top Flte Super-M 11x8. What I'd like to see is an rpm figure for the S.61.

Thanks,
David