I've found a local guy that has got a 6-71 blower forsale cheap and I got to thinking about getting it to put on my 383. I dont really know anything about a roots blower and had a couple questions. First, would a stock crank and rods live if I kept the boost low? What kind of compression would be required? Anything to lookout for when buying a used blower? I just need a basic schooling on these things. Anybody care to enlighten me?

http://www.moparts.org/Tech/Archive/bb/45.html

http://www.moparts.org/Tech/Archive/bb/57.html

Not sure if any of this will help, but there is some good info on compression, etc.

First question, is it a diesel blower or one set up for a car?

Is the blower stripped if it is set up for gas engines? If so, what are their condition?

You want to check the clearances between the leading and trailing edges. If I remember right it should be about .006, however, I recomend you double check that number.

Look for scoring on the end plates too.

Your stock stuff can take the blower IF you keep the boost low. That is done through a low starting compression approx 8-1 and keeping the blower speed low (under driven).

Are you looking at this for the WOW factor or for performance factor? If for the wow factor, great. If for performance, I believe you'd be cheaper just building the engine for the given performance you're looking for.

Unfortunatley I'm after the wow factor right now. That may change but I just want a fun street car with the occasional trip to the track. I believe it is a diesel blower had GMC cast in the back...

Better post some pic's of the blower so we can properly advise

there are numbers on the bottom of the webbing that will tell a blower company what size it is, 6:71 small case, 6:71 big case, 4:71, 8:71 or?

I'd say you can use it if... you have 9:1 or lower and keep it under 8psi.