I always run the stock GM dogbone lifters when I can. I have ran them to .635 lift and about 450# spring pressure without a failure. If you don't have a gen 6 block or need more lift or spring you are SOL.

I think the Comp lifter is very susceptible to dirt in the oil gallery. I’ve been doing a lot of reading on this and have come across others that have found grit to be the issue. Is this coming from assembly issues of the lifter itself, or insufficient cleaning practices? Maybe this is why other makes are failing.

The blown 454 that I had ran into a similar issue with a Comp 854 lifter. This was years ago but the failure was the same. These lifters had been used in another engine for a good many hours without any issues. I had two fail within an hour of being run on the dyno. Looking back on in, the only thing I can think of is that there was contamination - from my recently machined 454 block.

Since you probably won’t get anywhere with Comp, I think it would be a worthwhile to open up the bad one to see what caused the plunger to stick.

You could always contact Billy and see if theres anything he can do for you ...
I bet if you send him the part back he`ll send you a new set ..





.From: Billy Godbold [[email][email protected]]
Sent: Tuesday, November 09, 2021 7:58 AM
To: Daniel Baloun @ AccuMax Inc.
Cc: Walter Britton; Chris Potter
Subject: RE: new lifters



Hi Daniel,



We have a better lower design on the new lifter (stronger ears with a longer skirt), but I know Chris would love to see yours. Can you email Walley and see if we can get those back for inspection. You would not believe how valuable damaged parts are for us as we work to continually improve our designs and manufacturing methods.



Thank you,

Billy



Billy Godbold



COMP Cams Valvetrain Engineering Manager

Edelbrock Group




Hi Dan,



The COMP Cams, 3406 Address below is best. Sending them “ATTN: Walter Britton” would keep me from losing them…



Billy Godbold
3406 Democrat Road

Memphis, TN 38118

Direct: 901-375-3412

[email protected]

Good point TomZ. A lot of the BBC blocks having bad lifter bore to cam tunnel alignment would be 'lobe eaters'.

Getting a good clean on the oil galleries is hard to do if not setup for it, or don't have good assembly practice...or just have Mr. Murphy come for a visit.
​
Seems that opening up the Comp lifters and inspect/de-burr and tolerance check would go a long way to avoid the stuck plunger...should someone 'have to run the Comps'.

It certainly makes a good case for solid lifters, if you have the easy space to both pull the rocker covers and bar over the engine for the lash adj.

Also making the case for mild cams and blowers...

LOL. Having a home-made set of valve covers with the holes drilled above the rocker adj's helps considerably. Otherwise, gotta keep the idle rpms as low as possible. Having a cold one handy is always a good idea in case there's a flare up.:evilb:

A couple of cold ones… because you can never be too careful!

It's been a year since you had this issue. Did the replacement parts fix the problem?
I think I may have the same issue.

Yes. Everything worked out fine.

GOod to hear! Can you describe what the noise sounded like? Mine isnt' a perfect higher pitched "tick" noise. It's a little bit odd. Also - I can't differentiate which side it's coming from so this makes me think it's lower in the valvetrain. I had 4 guys here one day listening to this thing trying to determine what it was.

The lifter got jambed so there was about 1/4" gap with the rocker at the valve tip so mine was pretty loud and I picked it out as "a problem " at #5. I didn't know what the actual problem was until i pulled the valve cover. All the poly locks were adjusted the same so I pulled the intake and found the bad lifter.