4200
JC himself told me 1365hp @ 21 psi... I just didn't want to overstate what most combos will do, as he did extensive ehaust port work (he used the earlier heads). I will say- JC & Kevin are some of the true pioneers of this engine. However- since Kevin is bound by proprietary rights to some parts- you can ask about 'em, but unless JC wants to share, you won't get the same pieces without paying the same 'entry fee' he did.
Our group has overcome some of these hurdles, so if you don't feel like experimenting- drop me a line. Despite being stuck in Iraq a large portion of the last 4 years, I communicate regularly with the group.
Jeff
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