Rear main Main oil bypass mods (post member pics here!)

[Wesdog]

I was asked recently by a board member about this subject. This is a mod to supply additional oil volume to the rear main bearings and is usually only recommended for engines that will operate in the higher rpm range. I think MC can do a better job of describing the details of the mod than I can since it has been quite a while since I did this myself and he knows much more about AMC blocks than I do.
I wanted to use the the stock metal valley pan gasket with my engine so I used brass fittings and a 3/8" steel line to make a low profile version that cleared the stock valley pan intake gasket. If I recall correctly I believe the 2 holes are drilled and tapped to 1/4"npt. The photos below show the details of my setup for anyone interested:








editied by jeepsr4ever

[FrankNB]

On the second picture, there seems to be a line with a fittin on the other side of the block.. what is that?

[FSJ Jackson]

Looks to me like it's something on the floor, not the engine. Like an intake manifold. Might just be me though.

[73hornut]

Fill tube and water neck on an intake laying on the floor.

[Woody Long]

I just pulled a block out of a 81 Wagoneer and the PO had done this mod to the engine. What would be the problem with it being in a DD as well as a off-road machine?

[jeepsr4ever]

You can run a daily driver with this mod

[Woody Long]

Here are some more pics.

[fuzz401]

and more pic

[radamx]

This is with the extra oiling for the indy race heads that need to oil through the rocker shafts
The oil line on the back is reading the oil pressure at the back of the block.

[tarior]

That shore is purty, looks mighty spendy too

This is with the extra oiling for the indy race heads that need to oil through the rocker shafts
The oil line on the back is reading the oil pressure at the back of the block.