main bearing drama

[GOSFAST]

Originally Posted by Lawrie

I,m assembling a C69a engine,I ordered the main bearings for 1939-1948, the rear bearings won't fit into the block ,they are too narrow on the id of the rear main thrusts,(D dimension) the overall width is right(C dimension) where they fit into the crankshaft,also they only have a narrow locating tag,where as in the block it is a wide style.
looking at my stuff it looks like the bearings I got are for an 8Ba.
I think I need the 81a-6331 style.
Am I right
Lawrie

Hi Lawrie, if there's anyone in your area with a decent lathe you will be able to use that set. Not all that difficult for a good machinist?

You need to remove .015"/.016" from the backsides of the thrust surfaces on both shells. We've done a number of these over the years when the early sets weren't available/out-of-stock.

Thanks, Gary in N.Y.

P.S. Lawrie, on a side note here, this shot may help with another question you asked. These are nice pieces (stainless) considering the cost, just put another large number on the shelf.