Ed, thanks for the written info & input!
Thanks also taint. This would negate the reason for removing h-balancer surely!
Joreto, & any of you guys running 8k rpm for that matter, I just wanna know

Seriously. Why are we revving the hell outta these engines that were never designed for such abuse? Sure, I can see how Roman gets the extra hp as it plays a part with the high-ass boost he's running but, unless your boosting rediculous poundage, why are we pushing the engines that hard? They are not Hondas for crying out loud. No offense intended whatsoever but I can't help but see a really dangerous exercise in damage from rvving this hard.
The Mazda V6 MX6 KLZE engine revs to 8k but it is an all aluminium unit that has very short stroke & it is designed to rev quickly & sure, can run at this high rev output. The M103/4, can't see it happening reliably but, that's only my opinion @ this stage