This mystery pump sounds ok, but id be asking why so many have no issues with the std melling pump or the hv melling pump.

Just say if 1000 racers builds use a melling pump and 999 use it without issues and 1 does id be looking cross eyed at the 1 because something is amiss with the 1. Im meaning something with the build/sum of parts itself.

Lets backtrack a bit.
Who built this motor?
Were the parts inspected with the proper tools and people prior to assembly?
What brought on the need to freshen things up?
How long has the current build been in service?

Im asking these things because I have dumped a lot into a couple oem blocks (should of went the race block from jump) however I have one id not give up for anything, a 4 bolted 1/2 filled 71 360 block that ive beat to death, had apart many times and kept the same coated bearings.

This is mainly do imo to good solid machine work.

All ive ever had to replace out of the norm was the small end bushings from on the gas off the gas at high rpm.


Instead of beating a dead horse id consider finding a good crank grinder/shop and in short order they can tell you what state your crank is currently and what it needs. Its what they do, day in, day out.