I am thinking about going over and adjusting my rockers to be sure they are set exactly how they should be before I head to the dyno again. I am having trouble find out how much preload people are running with the "Caddy" or LS7r lifters?

 

I am running 1/4 TPZL with big studs. IMHO, ideal is 1/4 to 1/2 turns.

 

This is also what I have found works the best with the LS7 lifters. 1/4 turn to 1/2 turn should put them as loose as possible without having them make excessive noise

 

So on a 7/16" Stud, a 1/4 turn is what I'm looking for?

 

That's what I went with. As already said, 1/4 to 1/2 turn past zero is what you should shoot for.

 

i went with 1/2 turn on 7/16 studs,

 

1/4 turn past zero lash here as well....

 

When I used LS7 lifters I only went 1/8-1/4 past 0.

 

Anyone have any idea of how much preload a 1/2 turn is at the lifter in thousands? Just trying to guage the preload in thousands of an inch.

 

If my math is correct and I understand what I am reading form Shbox's site, 1/2 turn on a 7/16" stud is 0.02496" preload....?

 

Thanks. So 1/2 turn is about .025" and that would make a full turn about .050".

 

That is if my math/understanding is correct....

 

I hate to bring back a slight old thread, but I am trying to figure out lifter preload on Caddy lifters as well. It seems that most the responses were in regards to the LS7 lifters. I would like to verify what works best with the Caddy lifters? Thank you in advance for any help.

 

I would think the same advice given above would be fine.

 

Thank you for chiming in. These are so different from lifters I have run in the past where loose (1/8 or 1/4 PZL) gets you better results. I ust want to verify what has worked best for people using them in LTx engines and get it close before putting it on the dyno. I have tried anything from zero lash, 1/4,1/2, and beyond. Right now I am at 1 full turn past zero after reading that the Caddy lifters need the .060 preload. And if the math is correct, I should go about an 1/8 or so more. This is the info that seemed conflicting from above when folks were saying they used about 1/4 tpzl for the LS7 lifters.