Quote: Another way of doing the same thing I think.
The KB block has a separate oil gallery going to the main bearings first (priority). The restrictors keep high pressure/flow to the main bearings, while reducing pressure/flow to the lifter galleries (lifters, pushrod oiling to the heads). I don't think the lifter galleries are even drilled on most KB blocks, you have to buy that option (I did for pushrod oiling to the heads).
When my block arrives, I will check; but I believe the restrictors allow full pressure to the ports on the rear/top of the block and only reduce pressure to the lifter galleries.
