Re: pilot bushing options for 75 455
In this case have the pilot bearing O.D. turned down to match your crank. It has recently came to light the after market BBC bearing may be just a touch to large of an outside O.D. The difference is not much, I believe the dimension is in the U-Shift-Em section. Use a Brass type bearing and not the roller type.
I am not shure if the cranks intended for 4 speed applications were cleaned up just a touch (as all of the ones I have seen were drilled) or a Buick pilot bushing was a different size (smaller O.D.) than a Chevy and the aftermarkets close enough theroy is causing problems. Not everyone has had the problem, but a enough people have to see this as a potential concern.
I still find it hard to believe that when the engine was being assembled they knew which trans it was to be matched to though.
It seems the larger O.D. being pressed in the smaller opening distorts the I.D. of the bearing and not allowing the trans input shaft to slide thru.
1965 Riviera Gran Sport Super Wildcat
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1987 Regal Turbo T LC2 Y56 W02
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