Reply to "Leaking rear main seal - sometimes!"

Thanks for the comments, also the ones about the 351C seal :-). That's a very valuable diskussion for everybody. I'll consideer that when I rebuild my original 351C.

The motor I'm having the problem with is as mentioned a 351w. It's a later post-83 block with the one-piece rear seal. I'm pretty sure, that when Ford changed the 351w and 302 blocks to the one-piece in late '82, the cranks were changed too. I may stand corrected here. Post-83 Ford cranks doesn't have the slinger I think. The 5.0 cranks doesn't either. So all the aftermarked stroker cranks may follow the designfilosofi of the later crank!?

In most cases, from what I've read, the one-piece is a much better design, that normally last the engines entire life, in contrast to the older two-piece.


In reality I have no other options than to try and change the one-piece seal to a better one or try to reduce crankcase pressure. Luckily, replacing the seal is pretty easy once the transaxle is out.

Any suggestions as how to improve crankcase ventilation?