nm9stheham
Well-Known Member
If you remote feed the oil filter, there is a spot where you can easily tap off a feed to a turbo with little or no impact to the internal oil distribution.
My take on the oiling system crossover tube for the small block
- Thread starter Jadaharabi
- Start date
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prochargedmopar
Well-Known Member
Read these 2 pages.
You are given 2 options to upgrade oiling system.
One is restrict flow and open passages so it goes where you want it by tubing galleries.......
The other is to close off #1 main gallery feed to passenger side and install crossover tube to feed #1 bearing and drivers side oil gallery.
It States both are feasable options for up to 10k rpm engines.
Yes, the pickup tube and pan should be modified to support the increased oil requirements of high rpm demands.
This mod was CO-INVENTED by Larry Schreib and Larry Atherton so it says on the first paragraph of next page.
All blocks were sent to Bob mullins and Co. for the modifications to be performed.
Dropbox - Photo Nov 01, 11 54 45 AM.jpg
Dropbox - Photo Nov 01, 11 54 50 AM.jpg
You are given 2 options to upgrade oiling system.
One is restrict flow and open passages so it goes where you want it by tubing galleries.......
The other is to close off #1 main gallery feed to passenger side and install crossover tube to feed #1 bearing and drivers side oil gallery.
It States both are feasable options for up to 10k rpm engines.
Yes, the pickup tube and pan should be modified to support the increased oil requirements of high rpm demands.
This mod was CO-INVENTED by Larry Schreib and Larry Atherton so it says on the first paragraph of next page.
All blocks were sent to Bob mullins and Co. for the modifications to be performed.
Dropbox - Photo Nov 01, 11 54 45 AM.jpg
Dropbox - Photo Nov 01, 11 54 50 AM.jpg
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All the set screws I found were stainless steel or a harden steel never found a brass one. Then I went to the drilled cam bearings. Much easier to do the bearings and no broken taps or drill bits.
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Method 1
Sleeve the right oil galley and plug the left side front passage at the main journal saddle. This method is for solid lifter or solid roller cams. The lifters are splash lubed.
Method 2
The crossover tube method is used with hydraulic lifters. Everywhere I have read this was created by Larry Atherton although others have joined with him to published books that contain these methods.
It was designed to stop the starvation of the rods created by the right oil galley on the number 2 and number 4 mains
Page 9 of GJs thread talks about this and has pictures.
Any one interested in the oiling mods I did?
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prochargedmopar
Well-Known Member
I’m having hell trying to find proper fittings and taps to build the crossover.
Just Spent 30m in the back parts aisle of Autozone sifting through brake line tubing/fittings and never came up with something I could use.
Been to Home depot, Lowes, and O’reilly, and Tractor Supply too.
Bought 1/8” and 1/4 pipe taps.
3/16, 1/4, 5/16, and 1/2” long drills but nobody stocks a 9/16.
What a pita.
Next up is plumbing supply house.
May have to break down and just get everything online through eBay or ship to store. Uugh.
When you drill for the crossover you must be careful to place it at the proper angle. Otherwise you will not be able to screw the 45 degree fitting in.
Start with a small bit and work up in size.
You need a 7/16 drill bit and a 1/4 NPT tap
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Lot of 4 * 1/4" NPT Male x 3/8" Tube O.D. Steel Compression Fitting 45 Elbow | eBay
9/32" Aircraft Extension Drill Bit 12" Long Moly 7 Lifetime Warranty Dill Hog | eBay
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I used a piece of 3/4 inch inside diameter pipe. to adapt the 1/2 npt pipe to the pickup tube.
The pipe nipple is butted up against the pickup tube inside the 3/4 sleeve.
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.No I had it warmed up. It was hot.
But I have the engine pulled out now so I'll update on that plug under the oil sending unit. Should be there. Lol... I hope.
What did you find?
prochargedmopar
Well-Known Member
Ordered those, picked up legit 1/2” and 3/8” mpt pipe taps from napa, 3/8” o.d. steel tube also from Napa, 9/16” drill bit and some pipe fittings from Home depot, then ordered a 45/64” bit off ebay.
Should be good to go when it all comes in and be set for retirement on tooling. LOL
I’ve now got from 1/8 to 3/4 npt taps, plus bits, plus an assortment of looooong drills.
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What are you using the 9/16 for?
I haven't seen the crossover used when the lifter bores are bushed , my thought is that it isn't needed
mopardude318
Well-Known Member
Sorry, just got around to do this today.
So here is a piece of brake line inserted into the oil pressure hole:
Made a mark flush with the block:
Took a measurement, exactly 8".
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Sound like it's not seated all the way by about a half inch to me. I'll recheck.
What is the measurement under the cap?
mopardude318
Well-Known Member
I'll find out tonight, how far it is under the cap.
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2 1/8 - 2 3/8 inches under the cap
7 1/2 - 7 11/16 at the top
I would see if you could tap it in about 3/8 to 1/2
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nm9stheham
Well-Known Member
For reference, I just measured 2 here in the same fashion:
There is nothing critical about how deep this step is, and it may not have been critically set when originally drilled. And the plug may not be driven home all the way. Plus, if the plug is driven in with the cup 'up', the measurement from the pressure sensor hole is going to be deeper by around 1/4"-3/8". So, I don't think that any of these numbers listed in this thread are going to be exactly repeatable, block to block.
- 273 block - 7-1/2"
- 360 block - 7-7/8"
There is nothing critical about how deep this step is, and it may not have been critically set when originally drilled. And the plug may not be driven home all the way. Plus, if the plug is driven in with the cup 'up', the measurement from the pressure sensor hole is going to be deeper by around 1/4"-3/8". So, I don't think that any of these numbers listed in this thread are going to be exactly repeatable, block to block.
Just curious how would you install it with the cup up?
nm9stheham
Well-Known Member
It wouldn't be easy but I suspect it has been done...LOL
mopardude318
Well-Known Member
I just measured another 360 block I have in my garage. From the top it is exactly 7 1/2".
You can see here the mark on my 408 is 1/2" from going in on the 360 block I measured. :
Measured from the bottom:
2 1/4" inches:
Could this be a problem? Do I need to tap that oil plug in my 408 up from the main cap side a 1/2"?
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The lifter bore bushings are blocking the oil leaks around the lifters. Same affect as tubing the galley.
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I would tap it in.
Did you check the inside driver side rear galley plug to see if it is missing.
mopardude318
Well-Known Member
How would I do that? Remove that pipe plug on the rear right, and insert rod?
Driver side is the left side. Remove the plug at the rear of the block and shine a light inside. There should be a plug inside an inch or so in the end of the oil galley.
nm9stheham
Well-Known Member
The plug stops against a step. No one here knows for sure if the step is drilled at the same depth in each block. So if the step is shallow (up from the bottom of the block) you may be trying to drive the plug deeper than that step.
Just look at the plug in the passage up into the block (that the oil pump feeds through the cap) and look at the side passage leading off to the side towards the filter location; that side passage will be obvious. If the plug is completely clear of that passage, then it is as far up as it needs to be. That plug just needs to be clear of the side passage so the oil can flow out to the filter. This is the right way to check this.... avoids any ambiguities of such measurements.
There is a shoulder that the plug will seat against. So when you are driving it in it should come to a sudden stop.
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