Classic new lifters preload V8

My new lifters and new cam need preload setting. I didn't change the pushrods , they are ok.
I compare the new OEM with the original , it s quite the same (photos) except the size of the cup that hold the pushrod inside, it's larger and deeper. I wonder if i can put the original "cup" on the new lifters as they are paired with the original pushrods ...
Half of the lifters are out of the preload tolerance (2 mm or 80 thou instead 1,5 mm or 60 thou max) So i should put a set of 0,03" shim under the rocker arm to have a better preload.
If anyone still have this set that he didn't need...among the different size of shims.

roule said:

I wonder if i can put the original "cup" on the new lifters as they are paired with the original pushrods ...

Click to expand...

Any advice about that ?

À good question roule

Mark Piercy said:

À good question roule

Click to expand...

I think i will try this : change all my cups with the original ones : they match perfectly with the pushrods and they are a little less deep than the new one, so i don't need to shim the rocker arms...and i could put some oil in all the lifters during that time. Just to be sure they are ok for the first firing...

The original lifter doesn't have the small metal disc under the cap, and no hole in the cap as the new ones...

Finally i won't put any shim, i'm not far from the tolerance, and the lifters still have more than half the way down when they are in preload settings. And i won't go above 4000 rpm
Another question : should i pump my new lifters ? , i know there are 2 schools about that ...