which would be a better choice considering aftermarket cam/pushrods?

 

I would lean towards the High Volume pump, I think a little more oil volume would be a good addition for the additional rpm ranges that you may see with the new cam.....I don't know why anyone would need a higher pressure pump when these motors already have great oil pressure to begin with.

 

If i had to pick one, i'd go with Higher Volume.

My reasoning would be because of the fact the GenIII's feed the lifters then the main bearings. More Volume should yeild better lubing of the bearings as well as enough to keep those lifters happy...

Just my 0.02$

 

Some high volume pumps will suck oil pans dry. Something to look out for.

I'd think a ported LS6 pump would do fine. Shim it a little for high pressure if you so desire. There was a post in the advanced tech forum about shimming for a certain pressure.

https://ls1tech.com/forums/showthrea...light=oil+pump

 

IMO, If you are just doing a cam then I wouldn't worry about an aftermarket pump. An LS2 pump is a nice replacement for engines assembled with factory bearings and tolerances... if one feels more comfortable changing the pump for insurance purposes.
The Melling pumps are more designed more engine builders that tend to build motors on the loose side of the specs for higher horsepower apps to include aftermarket bearings that have larger oil paths that create low oil pressure issues with factory untouched pumps.

Bill

 

I was told that with an aftermarket Cam it was sound practice to switch to a ported oil pump. thoughts?

 

I agree. Higher volume pumps are typically need if you run more loose bearing tollerances. Higher pressure is always a good thing on higher hp/reving engines. A rule of thumb I follow is 10psi of oil pressure for every 1000 rpm you turn. Higher volume pumps on a high rpm gen1 sbc or bbc with a stock oil pan WILL suck the pan dry. I have no idea about the affects of stock volume pans and high volume gen3 pumps.

 

I think that is one of the "while you are there" overly used terms. From what I could tell about the "ported" oil pump I saw was that the inlets and outlets were debured and smoothed. So I just took a stock one apart, cleaned it up and shimmed the spring about .030". I don't know if it did anything but I felt better
Kinda like your prolonged rubbing on your J-tube

*EDIT* By cleaned up I meant I ported it a little.

 

Honestly I just don't see the need. Done many a GENIII head/cam jobs... and never saw a negative effect on oil pressure.

(edit) I would recommend a ported pump if you plan on seeing RPM's North of 6500...

... just my opinion based on my experience

Bill

 

I plan on seeing 6500rpm max. The recommendation was given by someone I trust. Was not based on the "while you are in there" mentality. So then a ported stock pump would net more volume, and a shimmed spring would net more pressure?