351W Rear main seal?

[cavscout]

Is it a one piece or 2? Mine seems to be leaking and I am just trying to figure out how long it will take to chane it out. I think the earlier models had a 2 piece, but I am not sure what year it changed.

[chuzie]

I am 99% confident it is a one piece which means more work for you.

[cavscout]

That's what I figured was going to be the case. Such is life though.

[bucketobolts]

What year model block? I used a late 70's block for my 393W. It is a 2 piece. I'm not exactly sure when the 1 piece became standard, but it is some time in the mid to late 80's.

[cavscout]

As far as I know the truck is completly stock, so I would guess the block is an 87' as well. I,m just not exactly sure what year they changed from the 2 piece to the 1 piece.

[DeTowman]

As far as I know the truck is completly stock, so I would guess the block is an 87' as well. I,m just not exactly sure what year they changed from the 2 piece to the 1 piece.

I believe it changed with Fuel injection....so u should be a one piece!

[cavscout]

This one is still running a carb, but I am about 99% sure it is a one piece. Thanks for the help guys.

[trkbilder]

Call the parts dept. @ your local Ford store, they can tell you for sure! :xyxthumbs:

[cavscout]

I talked to a buddy of mine that has been a ford mech for about 15 years. He does not have much exp on ones this old, but is sure it is a 1 piece. Just more work to get it changed out, no big deal.