if i was to build a 350 and supercharge it what would be the best compression ratio for that set up

 

Depends on how much boost you plan to run, and what kind of parts you use for the rest of the motor. 8:1-8.5:1 is pretty common, if you use a 4 bolt main studded block and run forged parts, keep the tune right you could run upwards of 15 psi, the key will be the tune and the fuel you run.

 

You should get the most power with very low compression and as high a boost as the engine can stand. When I used to run a blown Hemi, pre elephant, I got the best results woth a 7:1 compression, and 20 lb boost with a GMC 871 blower. You probably can tolerate a little less boost with a wedge head engine, but the idea is the same. What you really want a big space to cram in as much air/fuel mix as possible. With 7:1 compresslin and 16lb boost you wind up with an equivalent compression of 14:1, which is getting on the hairy edge. The bottom end and the rotating assembly will have to be extra stout to take the stress. It helps a lot to have a cam with a blower grind ro get rid of the exhaust as fast as possible, and some hefty exhaust plumbing to handle the flow. Fuel delivery will have to be seriously upgraded in order to provide at least twice as much fuel to feed the beast and to provide a rich mixture to prevent detonation. You start extra rich and lean out until the power is maxed out and you see aluminum specks on the plugs, then go a go a step richer.

 

thats what i was thinking but i didnt no for sure so i figured i would ask

 

i wouldnt go above 10:1 compression. going above that will greatly increase ur risk of detonation. i am currently running at 9:1 compression, it can run a little hot sometimes, but i will be taking care of that shortly.