Had seen before somewhere pics of below half inch oil pickup mod from oil pan side and below oil pump mount enlarge and port pics when going to larger pick up on big blocks.Have original block and want to do it right,already have drilled and tapped block for pick up just could never get a good idea of where to modify from there.Would sure appreciate any help in this area and sure don`t want to mess up and wouldn`t mind any other good overall oiling tricks too for my library. Thanks in advance....

PM me your email address, and I will send you a drawing of the oiling mods done to my block. It is too big of a file to post.

If someone wants to shrink them down and post them up for everyone, shoot me your email.

My E mail is in my sig.

Send em and I'ld be happy to help.

Match your pump opening to the block. I have seen the block as just a hole, but the pump has a kidney shape. You might not be able to match the shape exactly, but blend the block to the pump contours.

When enlarging the block hole for the pickup from 3/8 NPT to 1/2 NPT, move it over a little (using a milling machine). It gives more meat on the outside, and gets the pickup tube away from the crank/rod (stroker).

Resulting hole.

After tapping the hole.

Thankyou very much Jim,I was hours taking pictures of my pumps and block as it is now,using flashlight to show inside where it makes the curve and then can`t figure out how to post with my new computer.Files I already had from old puter are not opening on new so I got frustrated and next thing i know it is late I wake up on couch.I so appreciate this site and the knowledge and helpful people on it.Also have someone calling to buy my car,got bad news for em,I have not studied and worked on this thing for 21 years to sell it ,at least not before I see what it does at sea level more than once.I guess I have relation that thinks I should get rid of it.......No way jose!!! Keep em coming if you got em and edit this and put in tech archives then it doesn`t matter what the persons computer does.Thank you

I have some pics of things I did to the oil pump also. This is not half as important as the block oil passages, but FWIW.

You can slightly enlarge this passage too. I forget if it started at 0.597" or if that was the final size, the file only says 597dia

The discharge passage is only 0.5" dia from the factory, but the block can be 9/16 to 5/8". So I drill it to 9/16" dia, but not all the way to the o-ring groove. There isn't enough room, so I blended it there.

Drill this side to 9/16", but don't drill all the way through the O-ring groove on the other side!

Matching the hole in the block to the pump. The blue marker shows where I needed to grind.

On this pump, the filter fitting ID was only 0.475", so I enlarged it slightly. Don't get carried away and make it too big, that will weaken the thread area. And at 70-80 psi, the filter pulls pretty hard on them!

Here is what that filter side passage looked like before the blend in my other picture.

That is exactly what I was talking about,your the man Jim.I am very impressed by how thorough you are.Thankyou much

I think Jim pretty much covered it.

You can take a ball shape burr and relieve the inside edge of the sharp 90 degree turn that the suction side oil passage makes in the block.

Also, the last 3 Melling pumps that I worked on were badly misaligned between the pump body and cover, as observed where the oil passages are to line up (at the o-ring). They were bad enough that I had to open up the cover bolt holes, rotate the cover slightly and then drill and roll-pin the cover to the body.

I had a trw(probly) from 80`s and around 6 years ago purchased a melling(mancini`s) and the new one`s opening is lots bigger.I have lots of books on the big block mopar since 60`s and have learned how to match pump to block by taking pump apart and place base on there and then mark where to match block opening to pump.Thought I would add that to the post to those that don`t read as much as I have.I had taken new one apart to check it out before running first time and looked ok.Will do the block match too before all goes back together again.This post is mostly for stock or resto cause full race usually goes to external line systems and more expensive pumps.I think the statement it is all in the details means alot.I also try to massage has much as possible that most people won`t notice but makes more of a difference than you would think.I just don`t like that word failure,it is an expensive word in this hobby...Thanks everyone.