HELLO I HAVE A 340 ENGINE IN A 69 DART PROJECT AND WAS WONDERING IF I SHOULD HAVE OIL COMING UP TO THE ROCKERS WHEN I TURN THE OIL PUMP WITH A DRILL I GOT PRESSURE TO MY GAUGE BUT NOTHING AT THE ROCKERS. I DO KNOW I HAVE THE ROCKER ASSEMBLY ON CORRECT THE HOLES ARE ON THE BOTTOM NOT SURE HOW THE OIL GETS UP TO THE ROCKERS I HAVE SOLID PUSH RODS THANKS FOR ANY HELP

 

Turn the crank while priming and when the TDC mark gets to about 10:00 and 2:00 you should hear a squirt and the oil will flow through the cam journal up the block and head into the rocker shaft.

 

yeah you should definitly have oil coming up through there

 

The rockers are oiled through connecting holes in the camshaft. You must turn the crank in such a way that they are lined up, but they only feed one side at a time. Easiest way to do that is to use two people, slowly turn the engine with a wrench until you get oil, while using the drill.

Look at the inset to the lower right of this diagram. This depicts oil passing through the cam and up to one rocker

 

thats kind of strange u would think that the oil would travel though the bearings and up the shafts once it fills the bearings
is that because the drill cant get enough rpm to raise the oil to operating presser
have you ever heard of or have you used the cross over tub mod for the high rpm oil starvation problems
and also wat do you think of using hollow push rods instead of solids thats wat im using in my combo comp cams recommended them

 

No, the only path for the oil is into the bearing in one hole, and that hole MUST line up with the holes through the camshaft as it comes around. The oil goes through the cam, and out of the bearing up towards the rocker. For the split second that these all line up, a "pipeline" is formed which forces a small amount of oil under pressure up to the rockers.

When you prime with a drill, you are not turning the crank, so you must turn it by hand to line these holes up

If there were no holes in the cam, the oil would simply enter the bearing and spill out the ends.

If this sounds like a hokey design, remember, every SB and BB has traveled millions and millions of collective miles, and the rockers all work just fine for the most part.

 

As 440 says the "split second" it lines up acts as an oil restrictor, if not like this all the oil would pump into the top of the head. Works good.

Drill RPM not a problem as I usually use a speed handle and a socket to prime.

The crossover tubing modification is used to increase oil to #1 bearing for over 7000 rpm operation.

Hollow pushrods should only be used on Magnum stud rockers not LA shaft rockers.

 

why should la blocks only use solid push rods
what is going to happen to my 318 if i continue to run these hollow push rods are there any symptoms or is it just failure

 

Shouldn't have said "only". Hollows must be used on Mags but won't hurt anything on an LA.

 

cool
i would hate to think a company like comp cams ....well you know
i would assume if any thing it would in crease oil delivery to the rockers