Oil Restrictor

I pulled my recently purchased short block apart and see that it has a restrictor in the lifter oil port. We did this on brand X with roller lifters etc., but this setup uses flat tappet solids. Our old set-up did not have this and worked fine. Should this be removed or run it? We run 6K max and are at 5 to 6k for 12 to 15 seconds. Melling pump and Lima pan.
Thanks for all the help.
Perry

hpwdboss1 wrote: I pulled my recently purchased short block apart and see that it has a restrictor in the lifter oil port. We did this on brand X with roller lifters etc., but this setup uses flat tappet solids. Our old set-up did not have this and worked fine. Should this be removed or run it? We run 6K max and are at 5 to 6k for 12 to 15 seconds. Melling pump and Lima pan.
Thanks for all the help.
Perry

Which cylinder block do you have? An aftermarket block such as the A460? Or a passenger car block?

In either case, the answer to your question is usually (but not always) "yes" but it depends on particulars, including which block you have and exactly where the restrictor is placed.

Paul, could you elaborate, or maybe provide a link to a probably already existing discussion on this? I'm new to the solid roller world ("street"), and would also like to get it right the first time.

Thanks!

This is a cast passenger block D9 and the restrictor is in the passage in the front main leading to the lifter bank on the right (passenger) side. It was made of brass and has a hex set screw socket for installation and removal. I have it out at the moment for clean-up.
Perry

A restrictor in the front main large supply hole will somewhat limit the oil going to that main bearing and #1 rod.; (so more can go the the rest). Oil flows from the oil passageway under the cam bearing to the #1 main also, which is not the same as the other 4 mains.
The restrictor would need to be more than 3 inches down the hole to limit oil to the lifter galleries; one of which is the mail oil gallery for the rest of the bearings..

hpwdboss1 wrote: This is a cast passenger block D9 and the restrictor is in the passage in the front main leading to the lifter bank on the right (passenger) side. It was made of brass and has a hex set screw socket for installation and removal. I have it out at the moment for clean-up.
Perry

Like Randy said, it is not there to restrict oil to the lifter galleries; it is installed to restrict oil to the #1 main saddle.

The passenger car blocks use 1/2-inch main galleries throughout their main oil supply galleries. And you will notice the #1 main feed is 1/2-inch diameter while the main feeds 2-5 are smaller. The # 1 main feed is 1/2-inch only because this is the point from which the 1/2-inch main feed gallery is drilled to reach from the main gallery that traverses the front of the block and then RISES to the passenger feed gallery.

The brass restrictor is installed below that main gallery which traverses the front of the block, so the lifter mains are not restricted.

The #1 main, however, is restricted by the brass restrictor....since the 1/2-inch oil feed is effectively reduced by its brass restrictor down to the size of main feeds 2-5.

DO NOT install a passenger-side lifter gallery restrictor into the front of the passenger car blocks (anywhere above the front traversing gallery) because it will limit the oil supply to the mains and rods.

Paul

Once again, quick, clear answers to my many questions Thanks guys!
Perry