Any one interested in the oiling mods I did?

gregcon said
I combed through this thread, some good ideas and some I question.

The biggest question comes from the idea that the #4 main is starved as the oil prefers to fly past the feed hole....this is pretty dubious (as others already noted).

The desire of oil to go past #4 would pretty much be the same as it would for #2 and #3 if that were the case. Additionally, if there is 60PSI (or whatever) within the system, that pressure tends to exist independent of flow. In other words, if there is 60PSI at the #4 oil feed hole, oil is going to want to pursue the path of least resistance and go down that hole. It's not going to keep trucking past so that it can join the fight of maintaining 60PSI elsewhere. The oil will prefer to go straight past #4 if it's a no-pressure situation. But as soon as you pump more oil into the galleys than can escape, you begin building pressure and the oil is obligated to find someplace it can go to escape, even if it has to take a right angle turn.

Here's my question...I've read tons of theory, but no one has admitted to actually tapping a pressure gauge into #4 to read what's going on. Who has done it?

I also wonder...rather than letting the oil go to the mains then back up to the cam bearings (#2/#3/#4), what if you blocked it and fed those three bearings in the lifter valley using small tubing?

I think you've pretty much come to the same crossroad as everyone else. I'm not doubting the intelligence of the guys who worked with/for Chrysler that came up with the theory (in addition to tons of other great info), but it flies in the face of everything that a lot of us know about hydraulics and pressure. The story as it's told, is that the theory on the #4 was developed in a no pressures situation, using a bare block and a garden hose.

Like anything else, you have to take the info available and do what you're comfortable with. For every time that people scoffed at something that sounded odd, but turned out to be genius, there's 1000 times where something odd was just that.

Personally, I tubed the passenger oil main, and blocked supply to the drivers. I also reduced oiling to the cam by re-drilling the cam bearings with a .125 hole, and supplied full time oiling to the heads from a point earlier in the oil system. My experience agree's with the idea that keeping as much oil in the system for the rods/mains will do nothing but good things, and I consider all of those mods to be steps in that direction.