The last engine I did was about 5 years back. The lack of availability of the rear main seal swayed me to putting in the rope seal. It leaked for a very short time, then sealed up.
John Bizal sells what is reputed to be the Best brand rear seal. The old part number for the military is reported as National 5585, but no longer made. The civilian seals that were a problem are reported as part number 800093.
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