You have mentioned 7000 max rpm. i have been doing alot of research on this motor as i would like to build one myself for dirt racing(high rpms) but everywhere i read, they say the harmonics are really bad after about 6000rpm. what is your plan for it to not have the harmonics?
As you probably found in your research, the 292 doesn't like RPM. A 250 would better serve you this application, and can make as much if not more HP than the 292 will. If you just have to use the 292, avoid sustained RPM at or near the harmonic zones, either rev higher of stop short of the range you find them to be. Unfortunately, every thing that you do to these engines to make more HP, also makes the harmonics worse, like more RPM, more compression and more HP.
