How bad is it to run a stock oil pan with a high volume oil pump?

 

Definitely not recommended. Plus, an HV pump can cause premature wear on the oil pump drive. The result is sudden loss of oil pressure either by the pump drive stripping or by emptying the stock pan of oil at sustained high RPM. Neither is a good thing.

 

I run a melling m55 with a factory lt1 z28 high pressure relief spring. Hope this helps, Eric L

 

Its not recommended, however a handful of guys will come in here who do run the HV pump on stock pan. Sucking the pain dry is highly possible and does happen, I would not do it.

 

Well what if you have a 7qt oilpan and a Shon Herron billet oilpump drive is HV/HP pump ok then? I think the pn is Melling m55hv or something like that.

 

The factory pickup looks like it's in a poor spot in the factory pan. If you look in your drainplug hole with a flashlight in the low oil sensor hole, It become very apparent how a HV pump could starve.

 

$12,000 bad in my case. Well, that is an exaggeration, but it was still quite expensive.

Rich

 

The big pan takes care of the starvation scenario, but not the drive wear. However, you just don't need an HV pump unless your build demands it.

 

What is it that that wears the plastic gear that meshes with the cam gear or is it the plastic tab that bolts the drive to the block? Because if it's the latter the Herron billet drive assembly (which replaces the part that bolts to the block) should solve that problem.

 

The gear, itself, wears out. Shon's billet housing does not do anything for that. That gear wouldn't last a minute if it were plastic.

 

Just say "no" to HV pumps, there is no need for them.

Use an M55A(or select series) or put a gm parts counter high pressure spring in a standard volume pump. Set your bearing clearances at .002" rod/.0025" main/.0027" thrust main.

FYI the yellow melling spring is std pressure, green spring is high pressure.

 

I did alot of reserch on this forum regarding which oil pump to go with for my forged 383 with a stock pan. I chose the Mellings Select M-55 with the high pressure white GM spring.