Has anyone here run the new Comp Cams "R" lifters? Anyone seen gains at higher RPMs like they claim? They are only a few bucks more then the regular replacement lifters so I think im gona go with them unless I hear something bad about them.

 

Havent personally used them. But they are by Comp Cams. How bad can they be?

Whats the part number of these lifters?

 

63-875-16 from thunder racing. If anyone has factual knowledge of these parts, please post your results. Thanks guys.

 

ttt

 

I've been running the Comp R's for 2 years now, haven't had any problems with them. Can't say I've seen any high rpm improvement with them because I installed those the same time I did my cam swap. I think it's good insurance if you plan to spin your motor above 6000 rpms (or just go with a solid roller setup).

A lot of the LT1 guys run these lifters and heard of a couple of problems with them. That's not to say it's the lifter's fault, there could've been something else wrong with the valvetrain causing lifter failure.

If you do use the Comp R's, set valve lash no more than 1/4" past zero. Anything past that is too tight.

 

Im using them. Ive only got 600-700 miles on the engine, and everything is new, so I dont have any back to back results for lifters though. I bought them because I plan on shifting at 6500-6700 and any added insurance is welcome. Plus they cost about the same. One thing I did notice is that it looks like the lifter cant be disassembled.

Interesting, Ive never heard that, I set mine 1/2 turn past zero. Can you elaborate?

 

I didn't know that either until I read about it on the LT1 board on camaroz28.com. You might have to do a search over there but IIRC, someone couldn't figure out why he was losing power at high rpms and he was running the Comp R's. Several members told him if set his lash at more than 1/4 turn, it's too tight and that's his problem. Sure enough several people confirmed this when using Comp R's....so that's what I've been running mine at.

 

sounds good. thanks for the info guys. I think im gona go with the R's.