convert 2 peice rear main to 1 piece?

65FBE2 · Mar 1, 2010

Can this be done and if so what are the specs?

shoguun · Mar 2, 2010

i think you just buy a 1 piece

D.Hearne · Mar 2, 2010

Can't be done without going to a 1 pc rear main block.

zm830101 · Mar 2, 2010

D.Hearne said:
Can't be done without going to a 1 pc rear main block.

not necessarily. a 2 piece style block CAN be machined for a 1 piece seal. but the cost far out weighs the benefit. it really just doesn't make sense to switch. just run what you have. they both seal just fine. a 2 piece just requires a little more care during set up.

JonK · Mar 2, 2010

It can be done with machining, can't say if it's worth it or not but here's an article giving a short description:
How To Build A Better Boss 302 - Mustang Monthly

Jon

2+2GT · Mar 2, 2010

The 2-piece neoprene works pretty well, I can't see the point.

65FBE2 · Mar 2, 2010

I sell CNC machines for a living so getting the block machined will cost me nothing. Just can't find out if it is possible with out weakening the back cap to much. I have replaced the seal 3 times and can not get it to stop leaking. I have checked everything else as the source of the leak and it comes down to the rear main. Is there a slinger on the crank of a older 302 that may not be on a aftermarket stroker crank?

gjz30075 · Mar 3, 2010

What does the crankshaft look like where the seal rides? Perhaps a small groove there? If so, maybe this is what you need:
http://www2.chicago-rawhide.com/PDF/457027.pdf

It's a large pdf file containing sleeves of all sorts of sizes.

2+2GT · Mar 3, 2010

65FBE2 said:
I sell CNC machines for a living so getting the block machined will cost me nothing. Just can't find out if it is possible with out weakening the back cap to much. I have replaced the seal 3 times and can not get it to stop leaking. I have checked everything else as the source of the leak and it comes down to the rear main. Is there a slinger on the crank of a older 302 that may not be on a aftermarket stroker crank?

Yes, the stock crank has a slinger. Were your three seals neoprene?

The ridge on the far left is the slinger:

65FBE2 · Mar 3, 2010

Yes, all three were FelPro Seals. Do the 1 piece cranks still have the slinger? If not then I would guess that most of the aftermarket strocker cranks would not have the slinger. This may be the problem.

D.Hearne · Mar 3, 2010

No slinger on the 1 pc cranks. The knurling there also keeps the excess oil away from the seal as well. You might also consider the possibility that you've got too much oil in the pan too. I've had that problem with my 331 and the aftermarket pan I've got on it now. It was advertised as a 9 qt' pan, but try running anything more than 8 qts and it'll weep oil out both the 1 pc seal and the end radius's of the pan. The one piece seal, seals no better than the 2 pc.

68RCodeConv · Mar 4, 2010

I tried two black neoprene seals and still had a bad leak. Then I used the upgraded Felpro 2-piece seal. It is kind of a reddish color. It solved my problem.

10secgoal · Mar 4, 2010

If you having problems with a two piece, check to make sure the thing isn't two big. Have seen instance where when you install the seal into the block, then just lay the other side on the crank, the damn thing is too big. I clip about 1/8 of or what ever it needed to make it seat correctly. I left enough on there so it still did compress. You can, not see it, torque it down and the torque wrench will still click. It gets nice and tight, but doesn't seal.

convert 2 peice rear main to 1 piece?

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