HV vs HP oil pump

[GoMangoBoys]

2 oil pump questions.
1.  How do I tell if my oil pump is a HV or HP pump?  I bought a pump at the Indy swap meet and I don't know which it is.  The man had a whole box of brand new looking oil pumps for sale for $20 each he said that he raced and changed the oil pump after every race.  At the time, I did not know there was a high volume or and high pressure option so I did not know to ask.
2.  What are the pros and cons of one vs the other?  What application is best for HV and best for HP?
Thanks.

[nonfish]

The HV pump has a taller gear set, which of course means a taller body.
The HP pump has a heavier pressure relief valve spring installed.
The stock pump relief was set to be around 55 psi.
The HP pump was set to be about 20 psi higher.

[70vert]

Does the pump have a brand and/or part number on it to google? Assuming it has not been modified its your best bet to confirm what you have.

I'm sure there are more expert folks than I but the HV & HP pumps are generally used in racing scenarios, a street car should not really need one. The HV is normally mated with a larger pan and both may require other oiling components or machine work to be effective. I would definitely confirm what you've got before using (:

[Jay Bee]

Some info from Summit's website...

https://help.summitracing.com/app/answers/detail/a_id/4825/~/do-i-need-a-high-volume-or-high-pressure-oil-pump%3F

[GoMangoBoys]

This is the oil pump that I bought.

[JonH]

Who knows what you have...There should have been a tag on 1 of those bolts with a part number on it to identify what it is. If it was me I would be inclined to buy new so I knew what I had. I would never use a high pressure pump. Depending on what I was building I may use a high volume pump with a bigger pan....

[Chryco Psycho]

If I had my engine books here 
I can't recall the spec for the rotor height for HV & std .
I always use HP pumps but never use a HV without a much larger oil pan
I will see what I can find on the net ....

[Chryco Psycho]

Melling shows overall height of
std pump / HP - 4.64
HV pump -4.99
I know the rotors were approx .250 taller on the high pressure .
I can't find a spec for the actual rotor height yet .
Looking at your picture it looks more like the HV .

[MoparLeo]

Looks good on the outside but I would disassemble and inspect the rotors and case for slop or scoring. Need to find the maker to verify the factory clearances inside. An oil pump is a lot cheaper than an engine. Beware unknown parts...