who makes a small blower/ procharger with 3-5 lbs boost max want to stay turn key on my 500hps with minamal boost. have very little height clearance. whats better blower or pro charger/ whipple.

Turn key.... that is funny. I ran a side mount 2.3l whipple. It was ok for me but took some tuning and staying on top of. Also very rough on the drives if you aren't careful

I would think 3lbs boost would be turn key, set up properly.

Im diong my bottom ends this winter would i be better opff to make them 540s and stay natural im at appx 575 hp now. looking to get to 650 hp.

Yes, I think you would be better off building a larger NA engine if you only want 650 hp. Take your current setup to 540, 547, or 555 cu in and you will easily make 650+ hp. It will be a much simplier set-up over the sc. Now I think superchargers are great, but not in your situation. You could probably do the larger NA engine cheaper than a good sc set-up. It is definitely the way to go if you were planning on doing the bottom end anyway. Give me a shout if I can help.
Eddie

Thanks eddie ill keep you in mind when i get started.

3-5 lb boost will run fine call Dean at Gellners 216 398 8500

I would stroke them to 540's before even considering procharging them.