.012 is the total crush. The person on 460ford.com stated .010 to .015. The reason I went with .012 because that seemed to me how a one piece seal lip rides on a shaft. The shop manual states to soak the seal in
oil, I think that is to much. I used assembly lube on the whole seal and installed it. Remember to check the diameter of your crank before you start. I just machined one side of the seal surfaces and bent the seal to acommodate the diameter of the crank. I didn't use RTV because the friction of the crank will dislodge it from the seal mating suface and then it will stick at the bottom of the seal lip causing a leak. I highly recommend you practice on your old seal, because when your done this should look like a one piece seal. Absolutely no gaps at the mating sufaces. The degree of bevel at the mating suface has to correspond to the diameter of the crank. Remember we are trying to seal
oil with a two piece seal.
Remember what Chip says," Pay Attention to Detail."
I really don,t think this was one of Ford's better ideas.
GOOD LUCK!
