b71vette

We are having a 383 Stroker built. The builder is planning on putting in a high pressure spring into a standard volume pump to increase oil pressure.

Engine builder has said increasing the pressure is all that is needed, that the high volume just robs Horse Power.

Is it necessary to also have a high volume pump? If so what brand/part# oil pump would you recommend?

b71vette

Surely someone has knowledge and recommendations to share

stingr69

That is exactly the way I do it.

-Mark.

Matt Gruber

with 20w50 stock spring is good for 50-55 psi.
HV pump not needed.
with thinner oil use the high P spring

b71vette

anyone else have recommendations ?

thanks

glen242

Don't know if this is a recomendation, but I am installing a HV Melling pump on my 383 with a 5 qt, not 4 qt.stock pan.

b71vette

but I am concerned w the engine builder only increasing the pressure on a standard volume and not using the HV pump, would a High Volume/High Pressure be the best all around way to go?

T want to have as much input on this as possible before I go to the engine builder to ask for the change. HV/HP would probably only be an additional $100.

Thanks You all for sahring your knowledge

C3 Stroker

This is exactly what I have in my 383 and it has served well for the last 10 years......including some time at the drag strip.....30-35 lbs. of pressure at idle, and 60-65 lbs. when driving.

madvette74

when I did my 385 stroker I used a 7quart pan and a stock volume pump. I believe there was issues with the oil temp, pumping to much oil for a street car

stingr69

That is also the way Chevy did it when they built SHP small blocks. This is not an unproven modification. This Std volume/High volume decision is not one to sweat a lot over IMHO. You will not be in trouble either way you do it.

The HV pump is needed if you run loose bearing clearances but it does not sound like your engine builder is doing that. You should probably go with what ever he recomends. After all, you trust him with the rest of the engine and he does have to stand behind the job.

-Mark

b71vette

I had forgotten the full details on what the engine builder had told me - and that was HV was not needed based on the engine bearing tolerances he was using. So - I now feel a lot more comfortable on this issue, thank you Forum members, this is a great place to share knowledge and expertise, glad me and my son 71VetteLt-1 are members.

Thank You all !

Mod 77

I have had HV pumps pumped the pan dry at high RPM's and loose preasure. I have had really good luck with the high preasure sping. As said before it is what GM did.

MotorHead

Melling M55A SB-Chevy Z28 H.O. Oil Pump

Stock pump with higher pressure spring that's what I have that's all that is needed for a street motor

TXShark

If it is a street motor, the stock pump is more than adequate. The high volume pumps can actually suck the sump dry and then you have trouble if you don't have enough oil volume in your pan. I have a 383 in my car, moderate cam with a 5500 redline (low end 420 ft/# torque monster) and it runs plenty of pressure at idle and when run hard. Chevy stock pumps are great. I took the advice of Lingenfelter's book on small block chevys and they recommended a stock pump. Just tell everyone you have one (like a forged crank) Save the money for gas, heads, cam, and intake unless you're making an engine for the track.