If you have removed the balls and springs below the oil spray jets in the crank center, you will have low oil pressure at idle. Lower at hot idle. Probably 15 to 20 pounds is fine so long as oil pressure goes up with revs. In the stock crank the balls lift off of the seats and allow full oil flow at abot 1,200 RPM. So, at about 1,200 RPM oil pressure should be same as stock no matter springs and balls in place or removed.

 

The big bearings do not require much pressure at all, and there are no loads at idle. So, even 15 pounds would be no problem, but it makes some people squirm a bit to see it that low.

 

I used .180mm main jets and 100 PSI at full tilt. At idle 2,200 RPM my pressure is 80 PSI. with a Moroso dry sump pump.

 

Lynn E. Hanover

 

Here are some blocks that replace the filter stand and are used when a remote filter stand is used. The sweep 90 is very nice. The thick block is nice. The plug at the bottom is in a gallery that connects the inner and outer oil gallerys inside the engine. So that the stock oil pressure relief can still be used.

 

The thin block on the blue engine is just connecting the inner and outer galleries. Very thin.

 

The round block is mine. Thick enought to allow for "O" ring grooves and a fitting out at 11:00 oclock to feed the front main bearing (hard to see). The blue hose is oil in from the dual filter stand. The dash 4 stainless is oil pressure to the gage. At the bottom is the oil temp bulb getting oil temp 5" from the rear main bearing.  

 

You can make the bottom of the block flat and use a composition gasket. Note the Fiat on the bolt heads. I had a lot of Fiat bolts left over.