Originally Posted by
Canada1
I have attached a picture.
This is the large hole in the head which oils the camshaft/lifter lobes.
As you can see there is no brass restrictor in the North American heads.
We have never had cam wear issues.
Im not sure that the little brass inserts are actully restrictors?
If you watch the quanity of oil pumped up around the follower and spills out onto the little platform with the brass insert, you will see that is not much, my opinion is the brass insert is to direct the oil to a more accurite position to drip onto the cam.
Just my theory.
