don't forget Ram's new 9.5 & 10.5 twin disc series that just came out. I've also had a centerforce dual friction/billet steel flywheel, 5k RPM clutch drops were never a problem, always hooked up great. I like Ram or centerforce, I also have a buddy running a stroker, stage 3 heads/cams and a 3.4, he runs centerforce also, clutches last him about a year.