'89 roller-cam LA 360 w/Magnum heads - new roller lifters not pumping up

replicaracer43 said
The hollow bolt DOES NOT go into a pressurized oil galley.....its purpose is to alow "drainback" oil from the lifter valley to drain onto the little sheet metal tab, thus directing oil to the chain. The driver side oil galley is fed from a small (9/32 IIRC) hole up from the front main.

Good point - thought that it was fed from the gallery for some reason.

replicaracer43 said
The proper place to put the hole you drilled would be the passenger side plug, as you have a lot more volume of oil there due to the fact its the FIRST thing oiled, and is supplied by a 1/2 oil galley. That would be a negligible drain on the system. As it is now, your supplying 8 lifter bores AND your new hole with a much smaller passage, thus putting a lot more "leakage" percentage wise..... into the mix. Even the mopar engine bible mentions a small .020 hole in the plate on the passenger side..... Just food for thought.

Question - even though the pressure is higher on the passenger's side, wouldn't it be a safer bet to have the hole downstream of the main crank journal? Putting it on the passenger's side pus it upstream.

Not that it really matters in the case of this particular engine - it's as stock a build as you could expect, with exception to the Magnum heads. If Mopar decided the hole was OK where it was and it lasted as well as it has since 1989 (as I said before, I didn't put the hole in the welch plug; it was there from factory), I'm happy with it.

-Kurt