Depending on what you want it too do. I have/had a 360" with 11.00 to one, Flattops with 58cc portd heads. I lost some bearings and hurt the crank it's going back as a 383" motor with flattops. It's better too have a little less compression and spin the blower harder to get the boost, because of flame travel in the combustion chamber. In my case this is a 1471 Littlefield with a buzzard catcher, spinning at 20% OD, making 35lbs boost. There are other problems involved when supercharging a sm/blk, first and formost you either have too have a big blk snout on the crank or you have too run a crank support on the front of the crank. I run the crank support which is not cheap, but it keeps the front hub on the engine (about $1200.00)
Mine did run 4.62 before it hurt the bearings. Below is a vid in the garage, oil not a problem, leaking valve cover. I'm behind the camera on this vid.
Zip.
http://video.google.com/videoplay?do...3485455&hl=en#