Silver Slug

I put a new cometic head gasket in after having big problems with it first one (you can look up my other post) I been driving the truck for about 2 weeks and running 50 lbs+or- a little on stage six and egts about 1300 and eveything has been working great, but I was messing around with a mustang having a few light races and when I got home there was a coolent pushing out of the overflow bottle- no temp spikes or high egts and no external coolent leaks, the truck sounds ok but now it just pushes all of the coolent out- refilled the system and the same thing happens- this motor has something wrong with it that I can not see. I work on marine diesels for a living and have done plenty of head jobs and rebuilds, I had nothing but problems with the stock engine when I got the truck and this tops it.

Mike D

Take it for what it's worth, IMO it's a combination of the HR pump on a HO engine with a timing box.

bnold

Yet another cometic gasket issue...

ratsun

I had replied in your last post about some possible reasons why your gasket didn't hang in there and as luck would have it mine failed as well. It held about 2 weeks at 60-70psi then started filling the OF bottle. After literally hours of inspection on the head and block surface I believe the leak may have been between the layers as there are no signs on the block or head?
Anyway I just finished setting the freshly o-ringed head on the new stock gasket and should have it running by tomorrow afternoon. I think the MLS gaskets should be left to the third gen crowd.

Silver Slug

Well I going to pull it apart and going to o-ring the head, dont want to spend any more $$ on gaskets that leak in 2 weeks

ratsun

I hear yeah, I don't have much luck with the New Technology stuff
Should have just went with the tried and true and saved myself $3k and 3 weeks of down time

Tate

Thats not what I was wanting to hear.

swmnkdinthervr

It's a relatively new gasket process...I'm guessing at some point they will get this down (no consolation to those of you already dealing with a failure!!!) but Cometic is possibly the best gasket maker out there...I just hope they get it together soon before I need to take that step!

schoust

All I can say is I'm glad I waited looks like a simple o-ring job is in order. From all the failures It's starting to look like the R&D wasn't that extensive??? Man I love those gaskets on the Gaser stuff and it would have been nice. Back to the drawing board I guess......

ratsun

It would be nice to hear some feedback on the Phuzion gasket. Anyone run one yet on a Cummins?
I have no doubt Cometic will dial it in they seem to be a pretty top notch company.

Tate

I've already got the gasket sitting at home. Since I didn't get my studs in time for the last dyno, plan was to wait till spring to do the head. Good thing I guess. See if they do any revisions on it in the coming months.

ratsun

Good plan, IMHO I would see about sourcing a good shop locally to do O-rings for you. Or perhaps if you contact Cometic they will let you trade up the one you have for a Phuzion gasket?

dodgediesel

Tate, Aaron will hook you up and o-ring your head for ya.

1qckdodge

My Cometic let go after 1.5 months after install, it filled the overflow bottle on the dyno, but the good news is the truck dynoed 602/1059, anyway im going O-ring and stock gasket at .20 over, I was running a max of 60-62 psi but turned it down to 51 (factory setting for the Silver Bullet, live and learn I guess, next time ill wait awhile before I try a new product.now how do I tell my wife I gotta pull the head again and that the the truck needs twins, bigger sticks, nitrous, a cam, and a few other things that went bad with the gasket.

Tate

Yea, I may have to do that. Seems Cometic hasn't been having much luck with our gaskets yet. Hopefully I can get a refund.