It seems like everywhere and everyone you ask has a different opinion. Mark 4 GM block, bracket motor, isky ez roll lifters, shaft rockers with spring oilers.

Yes or no on oil restrictors at the back?

yes no less than .100

No oil restrictors. Haven't used them in years.

Bob

Sure, why not Gen 4 block? Oil draining back on the rotator is friction,... correct?

I always ran 100's on the two BBC's I ran. Both made decent power steel heads, utilizing that approach... 427 - 454

Back in the day they wanted the oil restricted to the lifters and thus the rockers. Keep it on the bearings. Now they want plenty of oil to the lifters to prevent wear. I stopped restricting the oil.

Will, In order to answer you restrictor question I would ask you what pump are you using, what weight oil and how many gallons you run in the sump. And also due you use parachutes? Answer the above and It will help answer the restrictor question. A high volume pump can empty a pan very quickly and load the heads with oil. If not enough oil in the pan and you pull the chutes you can run the remaining oil forward thus causing cavitation of the oil going to the bearings. Not a good thing.

quote:

Originally posted by TD1964:
Will, In order to answer you restrictor question I would ask you what pump are you using, what weight oil and how many gallons you run in the sump. And also due you use parachutes? Answer the above and It will help answer the restrictor question. A high volume pump can empty a pan very quickly and load the heads with oil. If not enough oil in the pan and you pull the chutes you can run the remaining oil forward thus causing cavitation of the oil going to the bearings. Not a good thing.

No on the restrictors, the lifters them selves restrict oil to the top end.

On the second part, the old story of a high volume pump "filling the heads up with oil" is BS....total and complete. Hate to address it like that but it gets old seeing it. Regardless of the output of the pump, it will only move as much oil as the leakage in the engine will allow. If you have too much oil staying in the rocker arm area of the heads, you have a drainback issue, NOT A PUMP ISSUE. You need to correct drain back. I ran a 7 quart wet sump pan on my last engine with a Titan pump, very well known for the volume of oil they can move. NEVER AN ISSUE with "too much oil on the top end, NONE...

Sorry to go off like that, but I just get tired of that being tossed around like it's gospel when it's been proven wrong....

One more thing to add. If you're losing pressure on the top end under braking, you have the wrong pan.....or too little oil in it.

We test pans on our dyno weekly. We fab pans weekly. 47 plus years of fabrication. When I started , I welded and offset ground my own cranks in my own shop. Trust me son, I have seen it all. Did I say use oil restrictors?
Please don't let the facts get in the way of what you believe. LOL

This message has been edited. Last edited by: TD1964,

Never said you said to use restrictors....that was an answer to Will....

I stand firm on my statement about oil on the top end though....not a pump issue, it's a drainback issue....

And we don't race dynos, dyno won't show what happens on a track.....hehehehhehe

Had to throw that in there.....

This message has been edited. Last edited by: Alaskaracer,

quote:

Originally posted by TD1964:
Will, In order to answer you restrictor question I would ask you what pump are you using, what weight oil and how many gallons you run in the sump. And also due you use parachutes? Answer the above and It will help answer the restrictor question. A high volume pump can empty a pan very quickly and load the heads with oil. If not enough oil in the pan and you pull the chutes you can run the remaining oil forward thus causing cavitation of the oil going to the bearings. Not a good thing.

moroso billet spur gear pump, Brad Penn 20-50, 7 quarts in Stef's kickout pan, no parachute. Motor will spin 7500 or so.

With stock blocks and Moroso pumps I used restrictors and drilled the holes out to a larger size.

Did not have any problems using them that way.

I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.

Street motor no restrictors, drag race motor, yes restrictors, and I'll go .100" to .125" because I like to party.
Oil is the coolant for the upper valve train.

Again though, with all the variables in engine purpose and goals for HP production, we could talk for days on end about different oil control strategies, I'm commenting on common use parameters. Sporty street and bracket racing.

I will add this.....since you are running that 20-50 syrup for oil, you can probably do without the restrictors.

quote:

Originally posted by Ron Gusack:
I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.

how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods

I would run at least 0.10” unless you have measured you lifter to bore clearance. If you have and the clearance is 0.001 to 0.0015, you can leave them out. Some never check that and hot oil is gushing all over the place. Buy a small bore dial bore gauge, measure it yourself and be certain.

I have made this comment before but when you order gears for your fancy a$$ Moroso billet pump you will get Melling parts shipped to your door. I would not be surprised if the cast pumps would maintain better tolerance in the heat cycle vs aluminum.

quote:

Originally posted by Will Harrison:

quote:

Originally posted by Ron Gusack:
I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.

how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods

These are Smith Brothers .375 with .080 restriction. I can't remember the wall thickness but I can look it up if you need it. I had them cut keeper grooves in them for rev kit springs so they're probably .165 minimum.

quote:

Originally posted by bry-war:
I have made this comment before but when you order gears for your fancy a$$ Moroso billet pump you will get Melling parts shipped to your door. I would not be surprised if the cast pumps would maintain better tolerance in the heat cycle vs aluminum.

dragsters are notorious for breaking pick ups and pump bases on cast iron pumps, so I use billet pumps only on dragster motors

quote:

Originally posted by Ron Gusack:

quote:

Originally posted by Will Harrison:

quote:

Originally posted by Ron Gusack:
I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.

how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods

These are Smith Brothers .375 with .080 restriction. I can't remember the wall thickness but I can look it up if you need it. I had them cut keeper grooves in them for rev kit springs so they're probably .165 minimum.

ok. By my math the hole is these pushrods is only .045, thank you