LA heads on a magnum block

The Magnum cam is the main issue as mentioned, no oil holes in the #2 and #4 journal. I made a fixture I use on magnum blocks to drill them for shaft oil. Works great and is 100% dead nuts perfect.

In the later years of the LA engines, they ran oil thru the shaft as normal, but also ran hollow pushrods that oiled thru with the lifters that oiled thru right to the rocker. These rocker arms had a little deflector on them right above the pushrod seat on the rocker arms, just like a Magnum rocker does. It was around 1989-1992, somewhere in there. All roller cam engines.

If you you run oil thru pushrods, you have to have these type rockers or try and drill a hole in the pushrod seat to get the oil to flow down into the bottom of the rocker. You dont need a ton with a stock cam, only 200# spring pressure.