Hello guys,

I´m just trying to find information on oild mods. Found in some topis that there´s some information in the book "How to build big inch Mopar small blocks". There´s another book that you recommend on this issue ?!

I want to do that cross over tube in the valley like someones say here.


And just one more issue, Is this really necessary for a 7000rpm 600hp LA Block !?


BR<

No, I cannot say it is necessary, my combo has been several seasons with no indication of oiling problems. Rocker oiling on roller cam, roller rocker .723 lift unbushed lifters. Bearings always look good on inspection and never had a rocker failure(harland sharps)

There is a fellow on here that go's by the screen name 40ford, he had a good post on Mopar Chat web site under the name Sanborn, very good read and I followed his suggestion's religiously and I have not had a issue,,,is it aboslutly necessary? as Lonnie said no it's not, but I did mine cause I wanted to.

all depends on build I have bushed lifter bores and was told a crossover tube was a waste of time I did enlarge all oil passages to and from pump and main bearings and restricted oil to cam bearings since I run external oil lines to rockers.

good info from a reliable source:



In an A engine with a solid or roller lifter cam we highly recommend installing the Chrysler P4120603 lifter oil block off tube kit. Regardless of whether you use a hydraulic, solid or roller cam we recommend the following modifications.

Purchase an 8-10” long 9/32 drill bit. Remove the main caps and on mains number 1-2-3-4. There is an oil passage which goes from the top of the main saddle to the lifter galley on the passenger side of the block. Slowly drill these four passages to 9/32. Cast iron is very hard to drill without the bit trying to hang so do not try to rush this job. If you happen to break the bit you will have real problems.

Take your oil pump and drill the neck of the pump, the section between the rotor and the main cap, 1/2 inch. Take a sandpaper roll (the kind used in porting and polishing heads) and go in the pump above the rotors and debur and slick the area above the rotors. You will need to slick the hole in the pump neck that you have drilled. Drill to 1/2” the rear main cap where the oil goes through and polish with the sandpaper roll.

You will need a 10” long 1/2” drill bit for the next step. With the rear main cap removed, look in the hole where the oil goes into the block. There is a 9/16 freeze plug which diverts the oil through the oil filter. Remove this plug by inserting a 1/4” rod through the hole where the oil pressure gauge goes in the top side of the block. Drill the hole 1/2” up to the lifter galley where the plug was removed. Remove the oil filter and any adapter or plates from the block. Remove the pipe plug from the block that is under the filter. Drill to 1/2” both holes that go from the filter to the passage that feeds the lifter galley. Now remove the pipe plug in the rear of the block, behind the oil filter and drill this passage to the center of the oil filter bolt 1/2”. DO NOT DRILL THE PASSAGES FROM THE MAINS TO THE CAMSHAFT. DO NOT RESTRICT THE OIL TO THE ROCKER ARMS.

Once all passages are drilled, completely clean the block very thoroughly. We use a Milodon #34010 Brush Kit to clean all the oil passages, and it works very well. Once the block is completely clean, replace the 9/16 plug that diverts the oil to the filter and the plug under the oil filter. If you make the above modifications you have greatly increased the volume of oil that feeds the crankshaft and the bearings of your A engine.

Sounds like Herb McCandless.

The tube in the pass-side gallery will allow only the use of a solid or solid-roller cam, as it cuts off supply to lifters.The cross over tube diverts oil and either camshaft type may be used.
After high speed bearing failure I have tubed a block and also added a plug(behind the camshaft thrust plate and plugged the gallery over the number 1 main intersect feed.I run fully grooved main bearings and have great oil pressure(hot and cold).
I would recommend this proceedure for anyone using a solid cam in a LA block who has encountered previous oiling problems.The tube mod provides effective oiling to the mains as opposed to factory layout which can struggle under high velocity conditions(the oil can't make the sharp right angle turns,usually into number 2 or 3)

I did the cross over on one, cant really say it helped
much... but the biggest thing is to drill the ports
to 1/2" like said above... I turn my engines up to at
least 8000 and more... I did have 1 engine failure
but it broke a rod(stock type rod) and it wasnt a
oil failure... at 7000 rpm you dont need to do much
EDIT
and drilling the mains with the 9/32

The only thing I have done on my last 2 blocks is to place a .065/.060 restrictor between the mains and the cam. Seems to work extremely well.

What is the problem drilling the passages from the crank to the cam?

I have looked through that book and read about the crossover. Absolutley no reason on any sm mopar for that to be done. Oil to the other side lifters can and should be turned off completley if a non hyd camshaft is used. To bridge across and feed it more oil over there, what could be the posible reason? All it could do is force more oil from around the lifters to fall down on the crankshaft and slow it down. My junk runs pretty good and hold up well. Also on the other post for oiling mods, that is a very good way to do it, other than opening up 1-4 feed holes to 9/32". I just do 2-4 and leave #1 alone as it is only feeding 1 rod so the factory size is good. 2-4 feed 2 rods each



418sbm with 587 ported junkyard heads--9.68 at 135+--6.09 at 111--1.26 60ft.--as far as 450ft with the wheels in the air--800+ passes and counting on same engine

Holes allready too large to camshaft. Can be restricted also by drilling a new .093 hole in the cam bearing and lining up new hole to block. That can only be done to 1-3-5 cam bearings unless you are going to oil the rockers with an external line. 2 and 4 cam bearings feed the rockers normally.

What I see is that there´s no big consensus here. Different opinions on the necessity of those mods.