Trick Flow heads on 5.9 Magnum block
- Thread starter mopfried
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Early magnum blocks have the oil holes already drilled! I have a ‘94 5.9 block that is drilled. My ‘96 block has the raised area for it but it’s not drilled.
No, use Comp Pro Magnum rockers and hollow pushrods. I just discovered this fact here on FABO from another member In Reno IIRC, doing just this very thing. The rockers are set up to handle this.
Here at a Summit racing is the page. Just scroll down and open up the questions area to see all the questions to find your answer.
COMP Cams Pro Magnum Shaft Mount Roller Rocker Arms 1622-16
https://www.forabodiesonly.com/mopar/threads/toluene-dart-73-swinger.87033/page-12#post-1972530090
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vitamindart
Well-Known Member
not seeing how that pushrod can supply that shaft with oil. its going to oil the cup, don't believe those cups are drilled. this will be one to watch.
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dano
Evil Handy Man
I think you also need a lifter with an oil hole as well. As I recalled the go to was an AMC lifter?
gzig5
Well-Known Member
Don't the stock Magnum roller lifters oil through the lifter? I think you are thinking of an LA block using Magnum heads. This is the opposite.
dano
Evil Handy Man
Yes you are correct. Sorry, forgot this was the other way around, the shafts need oil.
MopaR&D
Nerd Member
I put Edelbrock LA-type heads on a late Magnum block (rocker oil passage not drilled) and made my own external rocker oiling setup based on a similar thing @Toluene56 did on his engine (I believe he used Speedmaster heads on Magnum block). My build thread: https://www.forabodiesonly.com/mopa...magnum-edelbrock-la-heads-build.418466/page-4
Shaft-mount rockers are designed to have constant (or nearly constant) pressurized oil fed at the fulcrum point on the underside of the rocker shaft. Trying to oil through the pushrods into the rockers might work if the aftermarket rockers have internal passages for that but I personally would still want pressurized oil inside the shafts. I guess that's your call.
Or if the block is disassembled just have the passage drilled to oil the rocker shafts; all Magnum blocks came with the passages cast into the valley it's just the later ones (1996-ish and up?) didn't have the passage drilled from the factory. I didn't feel like disassembling my short block so I did it the complicated way lol.
Shaft-mount rockers are designed to have constant (or nearly constant) pressurized oil fed at the fulcrum point on the underside of the rocker shaft. Trying to oil through the pushrods into the rockers might work if the aftermarket rockers have internal passages for that but I personally would still want pressurized oil inside the shafts. I guess that's your call.
Or if the block is disassembled just have the passage drilled to oil the rocker shafts; all Magnum blocks came with the passages cast into the valley it's just the later ones (1996-ish and up?) didn't have the passage drilled from the factory. I didn't feel like disassembling my short block so I did it the complicated way lol.
Yep.. I have recently purchased trickflow heads and my set of comp rockers allow pushrod oiling so I won't be using my modified speed masters on this build anymore (they'll move to another).
Here are a couple pictures. It works as long as you have the oiling holes large enough.
Comp 1622-16 rockers allow pushrod oiling as well as the PRW stainless rockers allow pushrod oiling as well which should work just fine with trickflows and a magnum block.
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So the comp rockers mentioned above, with AMC lifters, will allow you to simply oil the shaft rockers on the tfs heads with pushrod oiling, and no external lines? Thanks!!!
Looks like. I pulled them off my other engine to double check and sure as hell they have oil passages in each rocker from the adjuster.
That's awesome! Following with wide eyes!!
gzig5
Well-Known Member
I think there is some confusion here, maybe it is me. Unless you are proposing using flat tappet lifters in a Magnum block.
The AMC flat tappet hydraulic lifters are for using Magnum heads on LA block. AMC lifters will supply oil to the pushrods. If you have an LA block, there is no need for that because the TF heads will get oiled the way they were designed to, through the block.
If you're using the TF heads on a Magnum block without the passages to oil the heads drilled in the block, you can use the stock roller lifters or other roller lifter that oils the pushrods with the Comp ultra pro magnum rockers and oil the rockers through the push rods.
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Yes if your using Hyd. Lifters. Double check link/call Comp.
No worries if your using stock Magnum roller tappets.
At least Comp says so.......
I probably did complicate my response with the AMC comment. My interest is running the TFS heads on a magnum block. And with a roller cam, so yes the AMC reference was incorrect.
To rephrase. Magnum roller block. No oil holes. TFS heads (shaft rockers).
Q: Are the comp rockers an alternative to the big $ set of Harland sharps in the TFS book?
I "think" I'm asking the same clarification question as the OP. I'm just surprised that these comp rockers are the magic solution to "how do I run LA heads on a magnum?" Tfs is irrelevant no? Have heard of the external oil lines. (As above) Never heard of rockers that simply have through-oiling to go from lifter, to pushrod, through rocker, into shaft.
Maybe I'm way out in left field. Trying to learn for my own knowledge, and possibly explore it for a HO crate offering.
Appreciate the responses btw. I can call comp, but you know how those calls go sometimes....
Might as well be asking about a Ferrari V10
Might as well be asking about a Ferrari V10
DrEamer
I suffer from cars on the brain!
So, in a related subject, is there a difference between a LA retrofit hydraulic roller, and a Magnum roller cam for oiling. Seems like I read on here somewhere that the LA cam was drilled differently for oiling the shaft mounted rockers.
Bobzilla
Well-Known Member
DrEamer; the cams are different but you can run a cam drilled for LA oiling in a Magnum block with no problems.
With the rocker arms that Toluene56 posted in pictures, you could even run LA heads with shafts on a Magnum block that is not drilled for LA oiling, or on either block with a cam that is not LA drilled, or any combination of block and cam that has the cam bearings installed rotated to block off oiling to the heads.
The other questions is, has anyone run these rockers without normal oil feed through the cam and block, oiling ONLY through the lifters and pushrods? How is the durability?
With the rocker arms that Toluene56 posted in pictures, you could even run LA heads with shafts on a Magnum block that is not drilled for LA oiling, or on either block with a cam that is not LA drilled, or any combination of block and cam that has the cam bearings installed rotated to block off oiling to the heads.
The other questions is, has anyone run these rockers without normal oil feed through the cam and block, oiling ONLY through the lifters and pushrods? How is the durability?
mopowers
Well-Known Member
This is the magic question! I'd love to hear from someone with experience.
DrEamer
I suffer from cars on the brain!
Thanks, since I have a early Magnum block I could go either way. It just seems like a good idea to stay with the LA oiling cam just to be safe on the side for the shaft rockers for now. Until some runs the Comps for a long enough time to prove differently, I will stay with something I know works. I guess the other question is there enough oil using a Magnum cam to feed a shaft rocker engine?
gzig5
Well-Known Member
I think my PRW SS 1.6 rockers have a hole in the adjuster that would feed oil from the push rod into or onto the body of the rocker, but I am pretty sure that is there to feed oil from the shaft to lube the adjuster and push rod tip. Not the other way around. I would want verbal or written confirmation from Comp that the Mopar shaft mounted rockers will live with pushrod oiling only. I haven't seen that in any of the literature. Can barely find the Mopar version on the website or the vendors anyway.
Bobzilla
Well-Known Member
If you get an aftermarket camshaft intended or sold as a Magnum camshaft, and it specifies it has been drilled for LA head oiling, like many of Hughes Engines cams and some others, you'll have NO issue with insufficient oiling from the camshaft.
If you were to re-grind a factory Magnum camshaft or buy an aftermarket camshaft that is NOT drilled for LA oiling, it will starve the shafts and rockers of oil. You'll need the rockers like those mentioned above with pushrod oiling provisions, or do an external oil line to feed the shafts.
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