1qckdodge

Here it is, it has 5 layers to it and looks like a very nice piece, so far the install is holding good, after my next re-torque ill lay into it and turn up my boost to 52 psi.

HOHN

Nice!! This piece should hold 60+ with ARPs, imo.

1qckdodge

Well thats what they said, one of the big tranny builders has this same setup running 80psi but with the head cranked down to 150 with no problems.

Mcmopar

150 ft/lbs? What kind of studs??

getblown5.9

I believe Dusty Hawk is using ARP's from what I read on another site.

scout98

Where do you purchase this Head Gasket

1qckdodge

Fast-Track Enterprise, Inc, very good guy to deal with, he a dealer for Cometic, yes its Dustys truck, I spoke with him about it and he said he is having no issues, ARP has 12mm studs that allow you to go to 150, however they cost a a bunch morel, I was told like $1350.

DHAWK

Studs Are Between 450 And 500 Bucks, I'd Have To Look. The Gasket Is Like 249. Anyways I Had The Block Decked, I Did Not Cut The Head But Took A Piece Aluminum And 220 Grit Wet Sandpaper And Sanded The Head To Removed High Spots. I Torqued The Head All To 50, Then 5 Lb Increments To 135. Then, I Let The Truck Sit For Two Hrs, And Did 5lb Increments Up To 150.
It Is A P-pumped 24 Valve. I Have Seen 90 Lbs Of Boost, But Have Cranked It Down A Little To About 80-85. It Run 12.22 First Time But Is Over Fueled Or Undertimed. It Has More In It But Will Take Some Tuning. I Like The Gasket, Nice Piece, And So Far Has Gone Above What They Said It Would Do. Hts Is Now A Dealer For Them Too, Since My Truck Was A Gasket Tester. Great Alternative So Far To Fire-ring.

Dshiftff

can you use O-rings with this gasket and would it hold more then a stock Cummins gasket if you did?

getblown5.9

the purpose of the cometic gasket is to eliminate the need for o-rings.

the gasket alone as stated above by dusty is holding up to 90 psi, where as a cummins gasket needs o-rings to hold that much.

this is both of course with studs.

dusty, are you using the standard 12mm studs or did you go for the "super high tech special alloy new age alloy" 12mm studs???

HOHN

I suspect that those aren't the std ARPs, as I have heard of them breaking at the 150 lb-ft mark, depending on the lube you use.

I don't think the regular ARP2000 studs can hold 150lb-ft with ARP lube. Maybe with 30wt, but even that would be a stretch (pardon the pun).

jh

dodgediesel

What makes the gasket so strong compared to a stock Cummins gasket to eliminate the need for o-ringing???

HOHN

It's not the strength.


It's the ability to maintain seal as the head moves around the block. HGs typically blow because of this lateral shearing. The MLS lets the layers slide across each other and maintain seal.

O-rings and (worse yet) Fire Rings are not a good idea for a street truck IMO because of the stress riser they cause in a head that's known for cracking.

MLS gives more sealing for a given amount of clamping. So you can have 220ksi ARP studs that will hold more than they will with regular gaskets. Or you can go with stronger studs and gain even more sealing. With the 280ksi ARPs, I'd think 70+ psi is no problem unless you have silly high timing.


The other nice thing about Cometic is that they will make gaskets in different thicknesses. So if you want a .020 thicker or .040 thicker gasket or whatever, they can do it. Whether or not they WILL do it depends on how many you're willing to buy, from what I understand.

jh

rhino 660

where is there web site looks like a nice gasket?

HOHN

http://www.cometic.com/domesticauto.aspx

Search under "Dodge" then select "Cummins 5.9"

Looks like they only have 24Vs for now, and it's .060 thick.

Justin