Yeah, I had a chevy 350 spin the first cam bearing that came to rest on the intake valve lobe and number one piston destroyed itself. after I put it back, the $@#%$ would NOT start for love nor money til I thought that one up. That 8 cylinder fogged up the garage like a mosquito sprayer, but it took off smooth and easy after I buttoned it up again. I tell my tech students (I"m a sub diesel mechanic instructor) that while you get the injectors purged, it also lets you build up the oil pressure on a new/rebuilt engine so the engine doesn't start up until you get the 50 lbs oil pressure.