Sorry, I got sidetracked from the original question that started the thread..... I used to have a homemade blower starter, a heavy barstard, sold it and went to an onboard starter for my 540 BBC (12.6-1 compression, Littlefield 14-71 compressor). After ruining a variety of top name flexplates and starter drives, I invested in a Mezeire 10 pitch flexplate and one of their starters, no problems since. I have been starting it off a start cart, with two 16 volt batteries, just using a small battery to run my electronics. Anyways, I prefer the onboard starter. Also, one less person needed on the starting line. Whatever you do, good luck and be safe.