Does anyone know if there is a difference as far as crankshaft balance for an L31 block and an L98 block? The L31 is 168 tooth flywheel where as the L98 is a 153 tooth flywheel, but are there weights on the 168 tooth flywheel or is it internally balanced on the crankshaft?

 

If you get a one-piece rear main seal flexplate, it will be properly balanced whether 153 tooth or 168 tooth, whether 305 or 350 or L98 or L31.

 

Thanks for the response five, so it doesnt matter if its an internally balanced crank or if the flywheel has weights on it as long as its a one piece rear main seal.