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Joined: Thu Sep 27th, 2018
Location: USA
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It does not matter
You just need to soak them in oil prior to installation
We run Mahle or Melling lifters here. I am sure NOS will also be okay?
They will pump up very quickly when the engine is started
You have to remove the heads on a OHV 4.0 to install new lifters (as I am sure you know by now)
Bear with me here I am brainstorming but in an effort to help:
You said this engine did not make the noise before the new pushrods and rockers?? Are you sure?
Lifters do not normally just go bad just like that.
You have perfect/good oil pressure for ohv
Looks like you have already verified the top end is oiling
A lifter noise can many many times be solved by running diesel oil in the crankcase for a while. Some people swear by seafoam treatment as well. I use the diesel oil to clean carbon deposits.
The thinking here is that you dislodged some debris (usually carbon buildup) during your work and it has now plugged the lifter oil passages. To dissolve the carbon, diesel oil change and drive it.......diesel oil contains many detergents.
Are you 100% sure it is a valvetrain noise?
In my experience of working on these trucks if a noise was not there before you did the work and is there after you did the work, chances are it is something you did.
You did not touch the lifters? But you may have dropped some debris into the lifter galleys?
You did replace head gaskets which means you did heads, lower intake, fuel rail and upper plenum gaskets.
The head gaskets could interfere with pushrods?
Lower intake interfere with pushrods?
Check the tabs on head gaskets and LIM gaskets and make sure they did not move during install
Have you tried running the engine with valve covers off to help pinpoint noise?
How does it run even with noise?
Any coolant loss?
Your post got me thinking, I'm gonna look really hard at things when this thing goes back together, I literally almost slammed it back together last time.
I'm gonna be looking at clearances closely.
One thing I did notice when taking it apart was that the rocker arms were not centered perfectly on the tips of the valves like I thought they should have been.
They we're A/M sealed power if my memory is serving properly.
I think I noticed that going together but disregarded it cause I knew there was no adjustment that I was aware of and I had assumed it was still a factory fit.
Can you or someone tell me how close to center they are typically?