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Head gaskets for high compression RB #563658
12/27/09 12:35 AM
12/27/09 12:35 AM
Joined: Aug 2009
Posts: 2,037
Mooresburg, Tn
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'72CudaRacer Offline OP
top fuel
'72CudaRacer  Offline OP
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Joined: Aug 2009
Posts: 2,037
Mooresburg, Tn
What head gaskets should I be using with a cast iron 440 block and aluminum heads with over 13.5 to 1 compression ratio?
Thanks, Brian

Re: Head gaskets for high compression RB [Re: '72CudaRacer] #563659
12/27/09 12:46 AM
12/27/09 12:46 AM
Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer Offline
master
Bob_Coomer  Offline
master

Joined: Nov 2003
Posts: 6,293
Rock Springs
Cometic for me


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
Re: Head gaskets for high compression RB [Re: Bob_Coomer] #563660
12/27/09 10:02 AM
12/27/09 10:02 AM
Joined: Jan 2003
Posts: 16,923
NC
440Jim Offline
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440Jim  Offline
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Joined: Jan 2003
Posts: 16,923
NC
I am right at 13.5 and have been using the Cometic head gaskets since 2006 with no problems. I coat mine with spray copper coat for head gaskets.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: Head gaskets for high compression RB [Re: 440Jim] #563661
12/27/09 10:13 AM
12/27/09 10:13 AM
Joined: Dec 2007
Posts: 148
Raleigh, NC
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Youngblood Offline
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Youngblood  Offline
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Posts: 148
Raleigh, NC
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Re: Head gaskets for high compression RB [Re: Youngblood] #563662
12/27/09 12:47 PM
12/27/09 12:47 PM
Joined: Jan 2003
Posts: 1,412
Johnstown
69dart Offline
pro stock
69dart  Offline
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Joined: Jan 2003
Posts: 1,412
Johnstown
Where's a good place to get the Cometic gaskets - looks like they run $99 per at Summit.

Re: Head gaskets for high compression RB [Re: 69dart] #563663
12/27/09 01:09 PM
12/27/09 01:09 PM
Joined: Feb 2004
Posts: 3,441
Mo.
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supercomp Offline
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supercomp  Offline
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Posts: 3,441
Mo.
I take out the rivets and spray both sides of all three with copper coat. No leaks.

Re: Head gaskets for high compression RB [Re: supercomp] #563664
12/27/09 01:55 PM
12/27/09 01:55 PM
Joined: Feb 2006
Posts: 698
Alberta Canada
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Edge Offline
mopar
Edge  Offline
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Joined: Feb 2006
Posts: 698
Alberta Canada
My new mill has cometics as well. However I read in a recent post that the mls Mr Gasket gaskets appear to be exactly the same as the cometics and it was suggested that they were in fact made by cometic but were priced around $20 a piece less. May be worth looking into


76 Duster work in progress
Re: Head gaskets for high compression RB [Re: Edge] #563665
12/27/09 02:50 PM
12/27/09 02:50 PM
Joined: Aug 2003
Posts: 43,096
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,096
Bend,OR USA
Quote:

My new mill has cometics as well. However I read in a recent post that the mls Mr Gasket gaskets appear to be exactly the same as the cometics and it was suggested that they were in fact made by cometic but were priced around $20 a piece less. May be worth looking into


I made that post, the Mr Gasket MLS nitril coated gaskets are Cometics I used the 4.410 bore size and the .041 thick gaskets. 1969dart, you do need to make sure that the finish on the block deck surfaces and the head surfaces are a 10 RA or smoother If not they may leak water around the water ports and out of the motor Been there done that on the first set of Cometics I used on a 426 Hemi motor several years ago BTW, the instructions with the gaskets say to not use any coatings on them, put them on dry, I did Maybe after using them once you might want to spray them with something They are three layers of stainless steel gaskets rivited together


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Head gaskets for high compression RB [Re: Cab_Burge] #563666
12/27/09 05:15 PM
12/27/09 05:15 PM
Joined: Aug 2009
Posts: 2,037
Mooresburg, Tn
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'72CudaRacer Offline OP
top fuel
'72CudaRacer  Offline OP
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Joined: Aug 2009
Posts: 2,037
Mooresburg, Tn
Thanks guys,
Looks like its going to be a MLS gasket. I did not realize that they were reusable. How many times can they be reused?
The RA10 finnish on the deck... just tell machine shop? How do I tell what finnish I've got? What about alum heads, same finnish?
Also head bolts or studs?
Thanks, Brian

Re: Head gaskets for high compression RB [Re: '72CudaRacer] #563667
12/27/09 05:45 PM
12/27/09 05:45 PM
Joined: Oct 2004
Posts: 1,752
detroit area
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moderncylinder Offline
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moderncylinder  Offline
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Joined: Oct 2004
Posts: 1,752
detroit area
ive reuse my cometics about 6-7 times,, spraying them with copper coat each time... i keep using them till they look like they are falling apart or cracking in the fire ring area







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