Oil Pressure Help

[Guy Johnson]

Hello everyone,

I have an all aluminum shelby 427 Big Block engine, that has been stroked to 468 inches.

I have a comp cam (roller cam), but with out the cam card I can only tell you that it is over 600 lift.

I have been having oil pressure problem.

When the engine was first built I was getting at idle 65 to 70 pounds of oil pressure.

When the engine was hot, I was getting between 35 to 40 pounds at idle .

When on the accelerator from 4000 to 6000 rpm I was getting almost 80 pounds.


The engine was rebuilt once because the roller lifter self destructed.


It now has been 10 years with 10,000 miles and it is now doing this:



Idle cold 40 pounds.


Idle hot 20 pounds and when accelerating from 4000 to 6000 rpm I am getting almost 50 pounds.


We believed once again the roller lifter has self destructed.

We had one problem where the oil filter seal popped and oil went everywhere.

The engine was on for about 15 seconds, but I thought you might need to no this.


So with just 10,000 miles should I be seeing this kind of oil pressure ?

Any Ideas on where I can start?

Guy