Because of that very reason you don't a bigger oil pan. If your going to use 20w-50 and racing at 7000 rpms is when you'll need a deeper pan. Of course a deeper pan won't do squat unless you have a longer pick up tube.

 

Good point on the longer pick up tube. I'm probably gonna use 10w-30 like I use in everything

 

High volume and high pressure is for race motors, and unless you go the whole 9 yards with all the components in the motor, the oil galleys and push rods for instance, are a restriction as to how much oil you can push through them.

 

Funny thing is I expected this motor to go 250,000 miles before any major work, considering the maintenance procedure I gave it.

 

When I built my my 340 for my old '74 roadrunner, the motor builder is the one who suggested a hi volume pump with the appropriate pan and pickup tube. He specificly told me I could not run a stock pan because there wasn't enough oil area. We didn't do much for the block but de burr and paint the inside. I always had plenty of oil where it was needed.
I did a crank replacement on my '69 roadrunner because the thrust area wore out on the original crank. I didn't want to change the pan because this was a restoration project so I installed a high pressure pump. Thats were I got the oil pressure reading from in my original post.
My ram easily goes over 4500 rpm under WOT and rev limits about 5200rpm.

EDIT: I honestly woudn't run a high volume pump with a stock magnum, with or without a pan change, but I believe Mopar performance makes high pressure kit for a stock magnum pump. BTW, you want to be careful running thick oil in these motors due to smaller passages and also because you need to lubricate roller bearings (lifters) which have tight clearances.

 

I will say that high pressure is more beneficial than high volume in an old motor, and of course in a high performance motor. In an old motor it will raise the psi obviously, but might even help clean out the plugged pick up screen.

 

zman17 I agree, but I don't think it'll clean the screen because the pressure increase occurs within the pump on the output side.

I'll stick with the high volume for a fresh performance motor. My '74 RR is still running with that system, and with a few more mods than when I owned it.

 

I know, that's why the wink.

 

make sure you verify with the seller on the capacity and sump placement before you order a pan. I know the R/T pans are supposed to work from what others have posted up in working combos, but I don't want you pissed at me if they send you something that don't work.

ALWAYS verify if you're the buyer!!!

 

A high volume oil pump is a machinests insurance policy. Because if they didn't get the clearances exactly right your oil pressure would drop off but with the high volume pump it will stay where it is suppose to because of the oil filling in the clearances.