Originally Posted by dparker
What topspeed said will work in setup. In my experiences, when you go with alot more HP engine your car will have a tendency to go right. Due to striking the tires harder. Usually you need more preload. If thats the case then shorting the passenger side adjuster bar a bit will a add a little preload. I'm basing this on the fact that your car was going straight with the other engine.
Actually Dparker, a high powered car will go left, not right. The turning condition he has is no doubt, due to the rear pointing that way or random preload, old tires, shocks with unequal adjustment etc. He said that they just made an adjustment in the squareness of the diff in his first entry prior to testing the new engine, that fact may have eluded your prognosis. When you make real power in a door car like 1200 or so you will find that negative preload is your friend. I have a car that I built and drive that needs no preload at all, in fact I use 1/2 flat negative to keep from going left. But I'm only running My crap in a door car at 7.62 ET at 187.22 MPH for what it is worth.