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I just installed a Viton seal in a friend's 389 about a month ago. We were doing an overhaul, and had the crank out of it. I don't think you can thread it in place with the crank in the block like you can with a rope seal.....you may deform it. It did work out very well, though. The rope seal in my '65 389 is still leak free after the rebuild I did in 1981.....I've got about 40k miles on it now. The '67 400 in my other car has leaked out of the rear main always...before and AFTER the rebuild. Next time I tear it down, you can bet I'll put a Viton (Vitron?) seal in it! Good luck
Jeff
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