Thanks for the info tech inspector...ill keep that in mind...maybe if i just rebuild the old block i will have to do a slight over bore. oh and cabilero i cant wait to see your numbers they sound very impressive. 380!!! thats great...but still just a guess. I bet it wont be too far off tho. are you running a carb or efi? do you think that my vortec head lt4 cam combo would work...ive heard of it working but never seen it in person. and one more thing, making under 400hp would the car still need street slicks or will just regular tires be the same. i would eventually want a centrifigal style supercharger but hell, thats far off.