[HWYSTR455]

Originally Posted by bhill86

Is this a standard recommendation when installing a 60lb pump or is it only for certain circumstances? As part of my “quick fix” on my engine I’m replacing my current 80psi pump with a 60psi. Not sure if I should try the shim or leave it be. Mild (at best) street motor FWIW

What's 'broken' that you need to do a 'quick fix' of swapping an 80 for a 60?

Why not put a high speed drill on the 80 pump and see what it's psi is?

Melling rates the pumps for max, and depends on a number of factors. From the factory, the 80 pump is about 70psi, and the 60 pump about 50 psi. (Straight from a Melling engineer, and the article is available online to verify this claim, have posted the link numerous times)

As for the ball, I know many do the ball swap, but personally, after 60+ engines, have never had a ball hang. If you disassemble a new pump and clean/check it, unless you have a lot of crap going thru your engine, the ball won't hang. And many have the same experience regarding as I have.

But if you want to swap the ball and shim it, go right ahead, but it's not needed. For a performance engine, and/or an HR cam build, just run the 80 pump, and you won't have to do any mods.


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