Here's a topic I've never seen addressed. Is it o.k. to run an engine with-out a heavy manual tranny flywheel or a torque converter with just the auto tranny flexplate bolted up? I have just built an engine stand to mount my engines on that I build in order to fire them up, adjust valve lash, check for leaks, re-torque bolts, check oil pressure, do engine break-ins, etc... before I install them in vehicles. The engines will all have front harmonic dampners and flex plates. Any harm? Any rpm limits? What do you think?