Jim bailey - 928 International

OK Brendan a quick google brings up ....."Cooant leak with Cometic head gaskets Advanced Tech.
web.camaross.com/forums/showthread.php?t=332020 - 92k - Cached - Similar pages

Leaking Cometic Head Gasket - NMRA Ford Nationals Series ForumLeaking Cometic Head Gasket Small Block Ford Discussion.
www.nmraracing.com/forums/showthread.php?t=43554 - 61k - Cached - Similar pages

SBF Cometic Head Gaskets .040 - FordMuscle.com ForumsStill in original wrapper, Cometic .040 thinkness MLS head gaskets for small block Windsor ... Cometic head gasket oil leak under full throttle and boost. ...
http://www.fordmuscle.com/forums/par...ets-040-a.html - 58k - Cached - Similar pages

Athena Jug And Cometic Head Gasket - SuzukiCentralYou can see where it blew "outward" and it was leaking coolant out of the .... I have modified a Cometic head gasket for my personal Athena 480 yfz like ...
http://www.z400central.com/invision/...ic=73011&st=30 - 103k - Cached - Similar pages

Cometic KA24DE head gaskets - FreshAlloy.com ForumsJust letting you know that it likely will happen. Just visit NICO anytime and look for any thread titled, "Cometic headgasket leaking..." ...
forums.freshalloy.com/showthread.php?p=1342282 - 88k - Cached - Similar pages

Need help. Cometic Head gasket leakNeed help. Cometic Head gasket leak: I posted this yesterday. Just want a few more tips or results from others. Installed Cometic Head gaskets.
http://www.mustangforums.com/archive...2859014-1.html - 9k - Cached - Similar pages

need advice on Cometic head gaskets!! please read ...It's not a bad leak by any means, just a little leak, a couple drops here and there. I called cometic and they said to take the gaskets off and inspect them ...
http://www.mustangsandmore.com/ubb/F...ML/006211.html - 35k - Cached - Similar pages

Possible head gasket issues again...no joke: RB20 / RB25 / RB26 ...We just did an LS/vtec conversion on a co workers car with a cometic headgasket, and we're pulling off the head again today to fix the massive oil leak out ...
forums.nicoclub.com/zerothread?id=304924&postid=3281545 - 96k - Cached - Similar pages

Factory MLS vs. Cometic head gaskets - ModularFords.comFactory MLS vs. Cometic head gaskets 1996 - 1998 Mustang Cobra. ... and even melted the head and had no coolant leak or sign of gasket failure on 17psi. ...
http://www.modularfords.com/forums/s...ad.php?t=20436 - 52k - Cached - Similar pages

eBay Guides - Vanagon and Westfalia head gasket issuesThe second type of head gasket leak is coolant over the top of the internal cylinder barrels, ... Cometic head gaskets SBF 302/351 AFR heads set of 2 ...
reviews.ebay.com/Vanagon-and-Westfalia-head-gasket-issues_W0QQugidZ10000000003434586 - 37k - Cached - Similar pages ....." that was page ONE !

BC

I guess thats all the proof anyone needs.

Almost every single one of those examples prove my point. To benefit from better technology, one must adapt to its usage. Its called "Disruptive technology" The Computer is a great tool, but when used wrong, its not a time saver. Its disruptive.

The MLS is a disruptive technology, as when the process is not followed properly -i.e, proper block prep, and usage of hylomar, then there will be leaks.

Those people in those threads probably took the head off, spat on it, wiped it off, and put it back on. Or they got thier machine shop to "deck the head" which leaves gouges the size of the grand canyon. These people are talking about "in car" engine work. This rarely ever goes well.

The requirements are a 50 or 60ra. Hylomar is also good. After that, very little issue.

I am just giving info like you are. But my info is first hand from people who have done this with OUR blocks. Such as what Hacker suggested.

But if you want to have a search war,

Here is a search right back at you. You searched for Cometic Coolant Leak, and I searched for "Proper Surface preparation Cometic Gasket"

Mitsubishi Lancer Register Forum - headgasket?For whatever reason, Cometic gaskets seem to be very sensitive to the surface preparation of the head and block. This is what Mike was getting at. ...
http://www.lancerregister.com/printt...hreadid=181910 - 9k - Cached - Similar pages - Note this

Cometic Phuzion Cylinder Head Gasket - Hot Rod MagazineCometic Gasket Merges MLS And Gas-Filled O-Ring Technology To Create What ... O-ring sealing system without special block or cylinder-head preparation. ...
http://www.hotrod.com/techarticles/e...ets/index.html - 66k - Cached - Similar pages - Note this

Is my head gasket leaking?? - V8Buick.comHe told me to stay with the Felpro gaskets as the cometics could be sensitive to surface preparation. He was sure of his surface prep of my aluminum heads, ...
v8buick.com/showthread.php?p=1112850 - 75k - Cached - Similar pages - Note this

AFR 225 'big bore' 72cc heads on a 346? - LS1TECHI have ran 4.160 bore and .040 thick cometic gaskets in my boosted application (18 ... The issues with Cometics are due mostly to poor surface preparation. ...
ls1tech.com/forums/showthread.php?p=8110252 - 137k - Cached - Similar pages - Note this

Head gasket thickness - Page 2 - Corvette ForumMLS gaskets are very sensitive to surface preparation and finish. ... I've got all the proper GM installation and removal tools for the balancer so I've got ...
forums.corvetteforum.com/showthread.php?p=1563241283 - 155k - Cached - Similar pages - Note this

BC

When I had my heads done by Todd in Green Bay after some damage from Fed ex, He found that they had previously been decked CROOKED, and he had to do it again to correct the angle. Shops screw stuff up all the time.

Nobody is forcing anybody. Advice was sought, and I provided some. In 15 years, when only a core of enthusiasts are left holding 928s, you guys can just still be using the 18th century fiber gaskets, while the entire rest of the world has moved on to more intelligent designs. Thats no problem. But it doesn't make it right. And people having leaks doesn't make it a fact for everyone.

BC

Posted on the corvette forums:

hacker-pschorr

Maybe you need to run more than 600rwhp on order for the Cometic head gasket to work like on Todd and Tim's motors?

Jim bailey - 928 International

Actually I never bothered to read any of those links was simply pointing out that lots of "information" exists and there is no difficulty in finding some which agrees with either opinion. I frankly have no personal experience with the MLS gaskets.

RyanPerrella

I would stick with the stock head gasket

Porsche has a slightly thicker version for use on cars whose heads have been milled down. You may want to check that out.

the flyin' scotsman

You've listed many areas where your upgrading the power and performance but no mention as to how you'll slow the beast.

I'd ensure the entire brake system is as good or better than stock; no good going fast if you can't stop.

Lizard928

Brent, I would recommend that you stick with a stock gasket, maybe try to find a factory one that is abit thicker.

I have yet to find a machine shop that I would trust to prep the surfaces for the cometic gasket up here.
I am still looking though, I will probably stay with a stock one with my build.

Jim bailey - 928 International

Malcom his car right now will do 170 MPH how often will he be exceeding that with more horsepower ?? There is no need for bigger brakes unless he were to track the car. It makes little difference if it takes 14 seconds to do 100 mPH or 12 seconds....too fast is too fast and bigger brakes do little to improve stopping ability on the first 100-0 braking they come into play after repeated panic stops...

hacker-pschorr

Even the stock brakes on my 81 stopped fine one or two times from high speed. After that...... Anything from S brakes on up can handle even severe track abuse.

special tool

Anyone considering headwork in the course of a supercharged engine should replace with the MLS.
DO NOT consider articles written by retarded persons on the interwebs!!!
THEY DIDN'T READ THE INSTRUCTIONS.

"Strength" is not the word to use here, the word is "resistance".
The cometic is much more resistant to detonation.

The following is a picture I have never posted before - the difference between preignition effect on Widefire and MLS.
Both of these gaskets were removed from COMPLETLY BLOWN TO PIECES blocks - test sacrifices. Notice how the fiber gasket gave up and the steel gasket merely lost some viton from barrel movement.
Neither gasket leaked a molecule of coolant ever, because they were installed correctly. Draw your own conclusions from this.
Its true that cylinder pressures were almost double of any 928 engine on this board, but you don't need to take this chance, do you?

hacker-pschorr

Thanks for the info ST - nice picture!

BC

I respect Mr. Tool more and more whenever he does stuff like come over here and explain himself and his experiences on a board with cars constantly bashed in his home forum. He has alot of offer (602rwhp on a 2.55L engine using C16 and lots of boost) wrt what to do when the engine is trying to pull itself apart.

IcemanG17

Hmm......I do know of a cometic headgasket stroker that was nicknamed "rainbird" since it leaked so much....(since then its been repaired quite nicely I might add)