I have them in mine, good luck

 

Not to hijack your tread, Ive heard the same as you, no restrictors to .060. I have seen some with stock style iron pumps with no problems change to the moroso billet aluminum pumps and they seem to drain the pan. I would like experiences posted on this too. Thanks Steve

 

No restrictors at all. I believe Crower will say the same in their literature. If you want "oil control", index/bush the lifter bores and back band/full time oil them. Then, you can do a .040”-.062” feed hole at each lifter.
Here's an example of a full time oiling bushing.

https://www.google.com/search?q=dar...0ahUKEwij-LzvzYPeAhXSq1kKHZ4LDswQ_AUIEigC&biw=1024&bih=666#imgrc=pUs_IZOqaM9gDM

I like to add a jumper/balance line from the main oil galley in the valley, to the back if the lifter galleys. Drill and tap between the last two.

Also, Plug/restrict the distributor oil feed too. Scott Foxwell has an excellent video on this mod.

 

I've done a few high end deals with the jumpers as well but, when I figured out the plug deal, I think they became redundant. I get oil to that last pair of lifters on the passenger side so quick now, I don't see the need for the jumper.
Thanks for the mention.

 

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None on mine, but it's a N2O track only combination with dry sump.


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Your right Crower does say not to use restrictors. The bushed lifter bores are an interesting solution, but a little high end for me. I already have the rotating assembly installed so any additional machining is out of the question. I’ve seen Scott Foxwells video for hydraulic roller lifters.
Thanks for the input.

 

First, lets ask, why restrictors?
I think this is an overflow from the old days where restrictors were used to keep more oil in the bottom end of blocks that needed the help. It was OK with race engines because most have soild lifters that don;t need a lot of oil, so restricting the top end was an acceptable way to force more oil to the main bearings. No other reason that I'm aware of. Fast forward to today and I think a lot of people seem to think it's a good idea "just because", but with modern priority main oiling, I don't see a need for restrictors. This is just my opinion, but as long as the mains are getting adequate oil, then there's no reason to restrict the oil to the top end, but I'll qualify that by saying as long as it's getting back in the pan in a timely manner. Top ends like oil. Valve springs like oil. Rockers like oil but I don't see the need for restrictors by default. The Dart BigM blocks will benefit from a plug at the end of the passenger side lifter galley, especially when running hydraulic lifters but personally, I don't run restrictors but I'll admit, my experience isn't as broad as many others here, so I'll just say again, this is just my opinion.

 

Thanks for your input Scott. I get your mod for hydraulic lifter rattling and believe it would benefit solid rollers, needle or bushed also. Do you find any distributor gear wear cutting off the oil? Or is there enough splash lube from below it’s just not a factor.

 

I think there's plenty of oil splashing around back there for the dist. Never seen any issues.

 

I’ve decided after all the research I can do I’m going with no restrictors.
Thanks for inputs, especially Scott Foxwell...

 

All I'll say is i run restrictors in all my solid roller stuff, a .060 restrictor moves a shit ton of oil.
If the lifter bore clearance is right, it'll flow oil...
I also agree with plugging the distributor hole after the last lifter.... distributors leak a lot.
Have seen no problems with gears not having enough oil.

 

All I'll say is I run restrictor's in all my solid roller stuff, a .060" restrictor moves a shit ton of oil.
If the lifter bore clearance is right, it'll flow oil...
I also agree with plugging the distributor hole after the last lifter.... distributors leak a lot.
Have seen no problems with gears not having enough oil.

I agree with that and generally follow the same program on all the stuff I build.

 

I was told by someone I highly respect as an engine builder that when you reach .090 it's the same as no restrictor. Like said,....060 feeds a bunch of oil.

 

I would wager this to be true. I went with .125 restrictors to help control some oil flow and it did absolutely nothing to help and changed nothing.

 

I have found with Dart Big m and big valve springs the pushrod needs constant oiling
Requiring to lightly scratch the side of lifter bodies
This then requires some oil restrictions to not over oil the top end

 

We've chased some oiling system and tune-up issues for several seasons now. Trashed a lot of good parts, and found a lot of not so good parts. Had a lot of bearing issues since moving into 582+ci engines, from old 496-509ish stuff. Hadn't even heard of restricting a Dart block until relatively recently; wouldn't run without them ever again.



If you modify the lifters as recommended by Dart, an .060 restrictor is still A LOT of oil up top. I just put .040's in and still seem to have a lot just priming it. - I like the idea of Dart's lifter mod and running the restrictors, as you create constant oiling to the lifters/pushrods/rockers, instead of just spits and sputters as the lifter hole cycles past the window. The mod creates a constant feed, the restrictors then keep the amount in check and force that much more on the bottom end. That is a win/win situation in my opinion.

 

You also need to plug the passenger side lifter galley at the distributor hole. Otherwise it's just an open circuit and a LONG way form the oil pump.

 

So if you "back band" a groove in the lifter bushing, install them and final hone to size, how do you clean the block afterwards, and at refresh time, etc.? Seems like it would be hard to get the trash out from behind the bushing. Maybe run pressurized solvent through the lifter galleys and have some junk lifters or some kind of bore plug in each lifter bushing and remove one at a time to flush each one or what??? Not that I have an extra set of .937 lifters or want to make 16 top hat slugs to do it. What is the best/easy way to clean them?

 

Thats one of the big reasons I don't use them any more.

 

Thanks for the replies!