maca

I have hit spot of bother that has me confused.



I was waiting for the cam to go in to check the lifters but just had a quick look and I am a bit confused. In the block where the lifter goes the oil gallery hole is on the bottom pushing oil up. So as you know it pushes up around the lifter in the stepped down surface area and pushes up through the little grove under the hole in the lifter as the lifter hole faces up. However the solid lifters don't have the same notch below the hole to let the oil in. They would have to be run with the hole facing down to get oil pressure but the link bars hit the block. Any advice appreciated
cheers

Coronet 500

If both are for an oil through pushrod a controlled volume of oil supplied to the upper valve train is critical. The "grooved" lifter will always pressurize the pushrod and have volume controlled by a sized restricting hole in the cup.

The other will have the oil hole exposed to pressure only on the down stroke covered on the upstroke acting as the restriction.

My machinist has told me that some Magnum lifters without the correct hole size will shoot oil across the shop when priming.

This all goes to the end use of the engine and controlling oil to the bearings. High volume pumps at high RPM can push too much oil up to the top of the heads starving lower bearings.

Going with the manufactures recommendations is key. I have sometimes taken out galley plugs or the front cam plate to view the oil holes exposure through the full lift of the cam, and to make sure the oil groove does not go above or below the lifter bore which would lose all oil pressure.

440roadrunner

You did not say what engine this is for. LA engines do NOT oil through the pushrods, and mechanical lifters for those engines have no oil passages. Only Magnum engines oil up through the pushrods

maca

yep its a magnum.
Comp finally got back to me and they said I need 8043-16
lifters
cheers

Coronet 500

Food for thought here.

http://www.forabodiesonly.com/mopar/...ght=EDM+lifter