351W Rear Main

Discussion in 'Fox 5.0 Mustang Tech' started by OldSchool, Dec 6, 2003.

  1. I understand that 351 Windsors have trouble with the rear main seal leaking. I put a 351 in my '91 (a Lightning short block from Ford Motorsports) and it leaked from day one. Recently, the engine was pulled and all of the seals were replaced while it was out. The rear main is leaking again and this time it's actually worse. Anyone have any experience with this problem? Can you offer any advice on a fix?
  2. YES it a major problem. That is why Ford went to the one peice seal in the later years. And of coarse the only part my builder will not warranty is the rear main seal so,
    I just pulled my motor and changed mine.
    I used a Felpro gasket and fixed that leak.. but now my Oil Pan is leaking so now I have another leak.
    What to Do?