As the title implies, here is a guts view of the gen 4 lifters. They are definitely redesigned, the spring is definitely stiffer, it is a two piece design now internally with an internal snap ring to hold them together. This was brought up in the "why camshafts do not perform well" thread so I thought it would be better to start a new thread vs. post on that one. Also, the oil feed hole is just slightly larger on the new lifter, and the top rocker/follower feed hole is smaller. Seems like the lifters would be less likely to collapse, but hard to say how much better they are than previous generations.





And the internals:








Crap, will repost internal pics as for some reason they are not full size.

 

Interesting

 

Someone with cams should throw these in and see if they pick up any power

 

id love to see results back to back on a car with cams or even just stiffer springs.

 

Are they the same external dimensions?

 

I may test these out this upcoming winter when I work on the car again.

 

This is very interesting indeed

 

I have 82# spring n stage 3 lsj t cams. Maybe I'll try

 

Did I miss a part number?

 

the good thing is swapping these out doesn't require lifting the head lol. definately in for more info if these don't collapse as easy i'd love to buy a set. going solid sounds awesome but its alot of money and work. thanks for the info OP!

 

I'm thinking of building a second motor for my car in the coming months, I may try these too

 

Id test them myself but i dont have a setup that would benefit.

 

Does anyone know if they use the same lifters on the intake and exhaust? I know the new motors have vvl on the intake cam which can be switched between 4mm lift and 10mm lift.

 

if they are different and the exhaust side fits, we should just be able to use all exhaust sides. I would assume they are all the same. The lash shouldnt change. That might actually be why they made them stronger (if in fact they are), because they were dealing with varying lift and were finding the old ones werent cutting it lol

 

If I'm understanding what's happening correctly it seems that anyone building enough cylinder pressure would benefit from upgrading their lifters. So I'd think anyone running enough boost, even on stock cams, should see a gain. Someone please correct me if I'm wrong lol

 

Hmm. That does make sense. Hell im down. How much is a set?

 

If I would had known about these when I did Equinox camshafts swap. I would had put those in!

 

I have them
Work just the same as my old they just won't separate under high rpm

 

Can you elaborate? They still collapse like the stock ones?

 

Exactly they still collapse underload
They just won't bust open underload
Better design but still the same

 

So running them is essentially burrowed time until they fail? So it's either solids or some how figure out how to run a physically bigger hydro lifter on the exhaust side that won't bleed as easily?

 

Can someone supply the part number? I might as well throw these in my build while it's torn down

 

Part number is 12572638.

 

Thank you. I figure if they help or not, it's not going to hurt to have the revised part in my build.

 

How do you know this? Just wondering for my own education. Sure the internal size isn't different concerning the diameter, but how have you tested to see they collapse?