408 oiling advice

Block the oil to the drivers side oil gallery either by putting a set screw in the feed under the number 1 main bearing or use a cup plug in that oil gallery, driving it in from the front (where the cam plate bolts on) until it goes past the oil feed coming up from the main bearing.

All that pressure side works helps, but 95% of getting the oiling better is increasing the suction side of the system.

Center sump pans have enough design flaws it’s not funny, two of them being that it’s hard to get an effective baffle in the pan for both acceleration and deceleration, and the fact that the oil pump is so far from the pickup screen it becomes a big restriction.

The longer that tube, the worse it gets. Getting as much area at the tube is the biggest gains you can get.

It’s gotten better today than it was back in the 1970’s and 1980’s because oils have gotten so much better. Sucking that thick assed oil up that small long tube was a big problem. If you are using a quality oil that isn’t a 50 grade that helps a bunch.

Gerotor pumps are different than spur pumps in that a spur pump has a more consistent, smoother, out put than the gerotor pump does.

If you look at the two side by side you can see the 4 lobes on the gerotor hold much more volume per lobe than does the spur pump. So for each Revolution of the gerotor pump (even if the gerotor and spur pump put out the same GPM) needs a bigger volume to fill the cavity.

So spend some time on the suction side because that’s where the biggest, most important gains come from.