I've had a little oil leak out of the rear main seal on the Ford 331 stroker in my 27 since the day I got it running the first time. It will even drip slightly just sitting in the garage overnight. This is a one piece seal. I thought I might have screwed up the first one, so I pulled the engine and took my time and put a new one in. Same thing, still drips a little.

While the engine is out this time I want to fix it properly and have spoken to Scat and FelPro. A guy at Scat told me he has heard of this and that Ford made two seals, one with an ID of 3.543 and another one with an ID of 3.493. He said to use the smaller one.

I have been going nuts trying to find one and finally did today at Summit.....it is on it's way. What do you guys think about this? Another guy I spoke with today at Scat says their crank is designed to work with the standard 3.543 seal. I just want to fix it properly this time.

Thanks guys,

Don