Ok, just got the new cam in my 472 Hemi. I'm using a custom grind solid as some folks here indicated my off the shelf hydraulic could be leaving some power on the table. Anyway, I know one of the advantages of solid lifters is higher RPM effectiveness. But a question I have is this: at what RPM do folks recommend deviating from stock internal oil system? I had heard that higher RPMs that the Hemi's oil system tended to give up. I never paid attention because I assumed it was greater that 6500 rpm. Since I was originally using a hydraulic I didn't care. But now that I may be living in the higher RPM range, I am concerned.

At what RPM is stock oil system deemed inadequate? What are options? Is the deficeincy in the pickup? Or downstream of the pump? I happen to have a used single pickup Moroso cover setup that came with my box of parts. But I am not sure it would clear the engine mounts. How do these special covers work? I assume I plug the internal pickup port and run a pickup from the pan to the cover assembly. I was looking at Moroso's web site and couldn't find any directions for their set up.

Moroso or Milodon???

For the Hemi you need the cover with the rear feed (I suspect the side feed would work too).

You block the stock oil pickup with a pipe plug when you remove the pickup. For the external system you need a pan with the external pickup capability. You can use a deep pan OR you could go with the road race pan.

I'd stick with the stock system as long as possible. The external oiling lines are a hassle to deal with on a street car. Keep an eye on the oil pressure gauge and see how it goes. Personally I'd add an accusump before I'd use the external line setups in a street car.

Thanks all. I did a quick mock up and the oil pump cover feed line would interfere with motor mount. I would need to have the cover with the feed line on the side I guess. The cam I have looks to have power range of 3500 to 6500 rpm. So I am going to stick with stock interal pick up. I went with larger pan (7 qt IIRC). Looks like I should be OK with stock pickup and deep sump pan. I do like the idea of an accusump. I just may look into one of those.

I'm running the swinging pickup and deep tie-rod tube Milodon pan in my Wedge 'Cuda. It's a 4.15 stroker motor and we did have to grind a bit on the pickup boss in the block to get the crank to rotate without hitting anything. I did have to trim the motor mount support on the K-Frame a bit to get the external line to fit. I have a one piece cover from a guy out in Oregon (?) that's CNC'ed out of a chunk of aluminum with a thin hardened steel plate between the cover and the pump gears. It all works fine but it is a lot of trouble for a street car. The pan hangs low, the lines are semi-exposed and it took me two shots to get it to seal up and not drip any oil. If I were to do it again, I'd probably just go with the road race pan.

If your not going to exceed 6500+ RPM stick with the stock style in pan pickup.

Lots of us have run 7500 rpm with the internal pick up. While observing a sight guage on the pan, reving the motor, the oil in the pan gets scary low, so I put in 2 extra quarts. I also accidentily went to 9300, and a rod bearing starved, welding it to the crank. So the limit is somewhere between 7500 and 9300 rpm.

At 7000 rpm's there is 5 quarts of oil in the heads of a 426 hemi

it is what it is

Years ago,Chrysler engineers did a study on the oiling system on a hemi.The concluded that 10 quarts of oil would have to circulate 3 times on an adverage 10 second 1/4mile pass.At any given time 5+ quarts were suspended in the oil passages and top end.They recommended at least a 10 quart sump to retain sufficient oil at the pickup.

Try this simple test:Take a stock hemi pump with a external plate and a #12 pickup hose,block off the engine side,remove the oil filter,stick the # hose in a 5 gallon bucket of oil and spin the pump with a drill at 2000+ RPM.Make sure you have another 5 gallon bucket to catch the oil,time it as how long it takes to empty the bucket(20 quarts).Now just imagine spinning that pump at engine speed.If that doesn't convince you then read all the old Mopar engine bibles and you will see that they recommend adding two inches to the sump or overfilling.They state 6 quarts is sufficient for normal use,any external systems should be filled with six to 8 quarts.Super Stock and Pro/Stock requires 10 quarts to keep the pickup covered at 8000 RPM under no load.