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Oil tube block mod #3003952
01/10/22 10:07 PM
01/10/22 10:07 PM
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Mt.Vernon ,Ohio
VernMotor Offline OP
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Anyone know why this was done. I don't understand this.

271778204_10159482553515202_7812451570782830419_n.jpg271748960_10159482553435202_1065994859387365229_n.jpg
Re: Oil tube block mod [Re: VernMotor] #3003978
01/10/22 11:25 PM
01/10/22 11:25 PM
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Bend,OR USA
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They probably wanted to prevent oil pressure loss if a right bank lifter popped out of the lifter bores, I would have used a much smaller line (1/8 to maybe 1/4 inch O.D.) to oil the driver side lifter oil galley to reduce the oil pressure loss if one of them came out twocents
I've had blocks bush in all 16 lifter bores to do the same thing as well as fix any of them that were too big on the I.D. or made crooked up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Oil tube block mod [Re: Cab_Burge] #3003989
01/11/22 12:07 AM
01/11/22 12:07 AM
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Fulton County, PA
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CMcAllister Offline
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Looks like they were minimizing the tube that was (is?) used in small block mods to bypass oil into the left galley in order to slow down the oil flow through the system and/or prioritize oiling to #1 main. Even though the big block system is plumbed differently. That was some 70s and 80s tech that I never got on board with. There are other, better ways to fix these.

If you're going to run a mechanical cam, the left galley should be made dry as it does nothing but oil the lifters. Bushing the lifter bores is almost a necessity for high RPMs and a good idea for everything else to control those 16 massive internal oil leaks.


If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: CMcAllister] #3004274
01/11/22 07:26 PM
01/11/22 07:26 PM
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Mt.Vernon ,Ohio
VernMotor Offline OP
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Not sure why you would want to do that. Most of us block it off so no oil gets there. But we run flat tappet cam. no reason to have oil there. More oil goes down to the mails and rods.

Re: Oil tube block mod [Re: VernMotor] #3004279
01/11/22 07:36 PM
01/11/22 07:36 PM
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Kalispell Mt.
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HotRodDave Offline
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Maybe they thought they needed to feed more oil to the lifters to keep the cam from going flat?


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Oil tube block mod [Re: VernMotor] #3004283
01/11/22 07:41 PM
01/11/22 07:41 PM
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Fulton County, PA
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Originally Posted by VernMotor
Not sure why you would want to do that. Most of us block it off so no oil gets there. But we run flat tappet cam. no reason to have oil there. More oil goes down to the mails and rods.


Only reason to oil the lifters from the galleys, as opposed to bushing the bores, is if you are using hydraulics or oiling the heads through the pushrods. Can still be bushed and drilled instead of having those huge oil leaks.


If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: HotRodDave] #3004286
01/11/22 07:44 PM
01/11/22 07:44 PM
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Originally Posted by HotRodDave
Maybe they thought they needed to feed more oil to the lifters to keep the cam from going flat?


Not going to help unless you have EDM lifters. Still don't need those huge holes feeding that lifter.


If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: CMcAllister] #3004287
01/11/22 07:48 PM
01/11/22 07:48 PM
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Kalispell Mt.
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Originally Posted by CMcAllister
Originally Posted by HotRodDave
Maybe they thought they needed to feed more oil to the lifters to keep the cam from going flat?


Not going to help unless you have EDM lifters. Still don't need those huge holes feeding that lifter.


Didn't say it would, just speculating on the thought process that went into that mod.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Oil tube block mod [Re: HotRodDave] #3004299
01/11/22 08:10 PM
01/11/22 08:10 PM
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I think they did it to get oil down to the mains quicker, on a stock motor the oil goes down the pass side crosses over in the back then runs all the way to the front on the dr side when it dead ends then the oil can be forced down to the mains, by filling the dr side with that tube as soon as the motor is started you don't have to wait for the oil to run it's normal course before feeding the mains. makes sense?

Re: Oil tube block mod [Re: old_racer] #3004304
01/11/22 08:21 PM
01/11/22 08:21 PM
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Fulton County, PA
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Originally Posted by old_racer
I think they did it to get oil down to the mains quicker, on a stock motor the oil goes down the pass side crosses over in the back then runs all the way to the front on the dr side when it dead ends then the oil can be forced down to the mains, by filling the dr side with that tube as soon as the motor is started you don't have to wait for the oil to run it's normal course before feeding the mains. makes sense?


The only thing fed from the left side on a BB is lifters. The theory is oil is rushing through the right side so quickly, as it has to feed the mains AND the left side from the end of the right galley, that the oil can't make the sharp turn to the main feed passages.

My theory is, plug or drastically reduce all the dang leaks so the oil isn't rushing through the system, squirting out all over the place, and can keep the crank full and under pressure.

High RPMs is where the issues show up.


If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: CMcAllister] #3004366
01/11/22 10:34 PM
01/11/22 10:34 PM
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Mt.Vernon ,Ohio
VernMotor Offline OP
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The guy has this block and a stock steel crank for sale for 2100.00 !!

Re: Oil tube block mod [Re: VernMotor] #3004456
01/12/22 09:14 AM
01/12/22 09:14 AM
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Rittman Ohio
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Originally Posted by VernMotor
The guy has this block and a stock steel crank for sale for 2100.00 !!


Seems high to me eek

Gus beer


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Re: Oil tube block mod [Re: fourgearsavoy] #3004535
01/12/22 01:30 PM
01/12/22 01:30 PM
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Fulton County, PA
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Originally Posted by fourgearsavoy
Originally Posted by VernMotor
The guy has this block and a stock steel crank for sale for 2100.00 !!


Seems high to me eek

Gus beer


The price or the seller? Or both?


This may or may not have been involved before that price was set. Just sayin'


[Linked Image]


If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: old_racer] #3004543
01/12/22 01:42 PM
01/12/22 01:42 PM
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Rio Linda, CA
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iagree Augments the crossover at the rear of the block.


Doing my best to irritate the herd.
Re: Oil tube block mod [Re: VernMotor] #3004552
01/12/22 02:00 PM
01/12/22 02:00 PM
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So. Burlington, Vt.
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I don’t see any benefit to stealing oil from the main feed from the pump, before it even gets into the main gallery.......and sending it to the pass side lifter gallery.

I’m not seeing it benefiting any of the bearings.

More oil to the drivers side lifters....... for whatever that might be worth.

Maybe in some race application that required running hyd lifters, where they felt the oil supply to the drivers side was compromised and caused lifter bleed down issues at high rpm.
Like NHRA Stock eliminator before the Schubeks came on the scene.
Nowadays you can just run solids.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Oil tube block mod [Re: fast68plymouth] #3004576
01/12/22 02:42 PM
01/12/22 02:42 PM
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Rio Linda, CA
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Originally Posted by fast68plymouth
I don’t see any benefit to stealing oil from the main feed from the pump, before it even gets into the main gallery.......and sending it to the pass side lifter gallery.


The mod sends it to the drivers side gallery.


Doing my best to irritate the herd.
Re: Oil tube block mod [Re: fast68plymouth] #3004577
01/12/22 02:46 PM
01/12/22 02:46 PM
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Fulton County, PA
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iagree However, the only thing being lubed from that galley is the lifters. 8 large leaks spraying oil that could be better used on the crank.

Putting oil in at the end of the system there basically fills the galleries from both ends. Intended to stop the oil from flowing through and ensuring the entire system is consistently full and pressurized.

Again, solid lifters or not oiling the top end through the pushrods, or oiling the heads externally, plug the left galley and make it dry, eliminating the problem.

Using an internal auxiliary hose/tube can be beneficial, if the left galley is plugged and the oil is plumbed into the rear of the right galley, filling it equally from both ends.

Last edited by CMcAllister; 01/12/22 02:50 PM.

If the results don't match the theory, change the theory.
Re: Oil tube block mod [Re: John_Kunkel] #3004586
01/12/22 02:59 PM
01/12/22 02:59 PM
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Originally Posted by John_Kunkel
Originally Posted by fast68plymouth
I don’t see any benefit to stealing oil from the main feed from the pump, before it even gets into the main gallery.......and sending it to the pass side lifter gallery.


The mod sends it to the drivers side gallery.


Right...... typo on my part.

Oil is diverted into the drivers side gallery from the main feed out of the pump.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Oil tube block mod [Re: fast68plymouth] #3004860
01/13/22 12:40 PM
01/13/22 12:40 PM
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westerly, ri. usa
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i would just plug it, looks like it would be a big oil pressure loss, he may have had cam issues?

Re: Oil tube block mod [Re: 440lebaron] #3004899
01/13/22 02:20 PM
01/13/22 02:20 PM
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Fulton County, PA
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Originally Posted by 440lebaron
i would just plug it, looks like it would be a big oil pressure loss, he may have had cam issues?


Cam is oiled from the mains. 5 more big leaks.


If the results don't match the theory, change the theory.
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