Every bigblock rear main seal leak I’ve encountered was one of two things... either no sealant between the block to retainer mating surface (most common),or interference from main cap/ stud causing misaligned retainer. People are always fed up on this repair. I usually get the “I don’t care what it costs” rant. They have missed simple steps several times before I see it.
It's been a little over 3 years now and the customer and I have been in touch and no leaks. You must not have read the entire thread Trendz.
I still experience some anxiety when I assemble a B/RB , but am extremely happy to report I have not had one oil leak when using the 12 and 6 method in conjunction with enlarging the retainer holes. Thankyou again everyone and Monte RIP. J.Rob