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Further info on the Auto-Lash part numbers for anyone pursueing them: Jacobs Auto-Lash P/N 013369 superceded to 022576 which crosses over to Cummins P/N 3871407 for a 6-piece kit.

Will, thanks for chiming in with those corrections and other definitions- much appreciated. Looks like they want about $100 apiece for those Auto-Lash adjusters and at 6 per engine that's a premium upcharge just to run a divided entry turbo. Oh well - this is funner than collecting stamps 😁

I think I found the Jacobs document mentioning the replacement of adjusting screws with Auto-Lash adjusters on page 3 (listed under Small Cam III) of the install manual for type 401 jake heads. Do you think this change mentioned for a Small Cam 3 would work on our NHC-250?

I'm missing 3 oil supply screws (p/n 199225) and I cut off 3 of those special stud nuts that were rusted on. Does anyone have any extra of these they don't need anymore?

My search for 425A Jakes for a decent price proved fruitless so I ordered a 25B kit and it just arrived today!

I've been doing some light reading of the Jacob's install manual for the 425/425A model and I'm kinda leaning toward this model over the 25B since it's a bit more versatile with Big cam vs Small cam and single entry vs split entry applications: The downside is that they are a little more...

Good luck in your search! The V8-300 is the diesel 10 ton engine, right?

I appreciate you continuing to look. I definitely want to gather the correct combination of parts so I don't mess up my engine.

I found some more info from the Jacob's literature-not Cummins- and it warns of no 25B with divided entry turbo and also when I load the CPL 0026 the application guide points to model 425A which has no warning about turbo entries which makes me think the 425A is more versatile. So would a...

Ok, so here's another question. Can jake brakes with the auto lash adjusters be used on an NA engine safely? I will most likely have the jake heads installed a year before I get the turbo put on.

Do you guys think that a divided exit manifold combined with a divided entry turbo would not require the special adjusting screws?

I found some info on the PACBRAKE website regarding the single vs divided entry turbos and they call out special adjusting screws for divided entry turbo applications. I don't know anything about PACBRAKE but they use Jacobs same nomenclature on things. Maybe some of there parts are...

Will, these are the aspects that I was trying to recollect from an older post of yours - thanks for responding! For the record I currently do not have a turbo exhaust manifold or a turbo so I do have the flexibility to choose the correct combo. I plan on adding 25B jakes.

I'm to study up on jake brakes and turbos for the small cam NHC 250 and I have 2 questions bundled together here, but i think they're related. 1. What are the differences between the jacobs 25A & 25B compression brake? What I've read so far suggests the 25A is iron? and the 25B has an...