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Discussion Starter #1
whats a better gasket to seal my 408sbc..Im making changes and plain on running a lower comp motor this year and spraying up to 600hp via fogger/plate....i drive this car alot on the street also
 

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I run coppers but I have heard great things about the Multi Layered Steel gaskets (Cometic, etc.). I can't try the MLS gaskets without eliminating the o-rings from my block. I would give the MLS gaskets a try.
 

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Cometics or O-Ring Expense

It was a choice between the O ring set up or the Cometic MLS. I run AFR Heads and was advised by them to try the Cometics MLS before going with o rings. We went Cometic and have never had a problem, but the surfaces of the heads and block must be smooth. Try this rep at Cometic. He is good to work with. K Kistner
E-mail Address(es):
[email protected]
Mooreboys
P.S. O-rings are the absolute best seal with copper, but the Cometic
MLS are right up there and will work on all but the most severe application.
 

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Think of it this way the most powerfull and explosive engine's on the planet are the nitro fueler's they use the copper oring and receiver groove not the MLS I am sure that with there budget's and R&D someone at sometime has tryied the MLS on this application and it must not have worked or they all would be doing it right?
 

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Also take into consideration whether it's a street car or not. Copper gaskets are famous for problems with sealing water jackets. SCE has some new copper gaskets with a 'printoseal' style embossment on them, as well as an integrated fire ring, but I haven't used/sold them personally. Check SCE's website. Personally, I've sold many of the Cometic MLS gaskets for 'hardcore' street car guys with lot's of nitrous, and or blower/turbo cars as well. Never ran into a problem, and they seal the water jackets nicely as well.
 

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Discussion Starter #6
I use the sce titan gaskets with the water seals now...They do nothing but leak water :(
sounds like the cometics are the ticket for me since i do street driving alot....not jus a race car here
thanx for all the help
paul
 

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Discussion Starter #7
Zeke1 said:
Think of it this way the most powerfull and explosive engine's on the planet are the nitro fueler's they use the copper oring and receiver groove not the MLS I am sure that with there budget's and R&D someone at sometime has tryied the MLS on this application and it must not have worked or they all would be doing it right?
ya but they dont seal water and dont drive on the street were the engine gets hot n cold constantly
thanx for the info though :lol:
 

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Cometic

nos81bu, For what you are doing the Cometic MLS Gasket is the top choice. Don't know too many of us driving Top Fuelers around. Staying in the real world go Cometics! You wont be sorry.
 

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Discussion Starter #9
ya thanxs man im goin to try them out...now there 3 brands mr gasket,felpro and cometic.
whats top choice?
 

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I've used the Mr. Gasket twice, but in milder applications without problem. Cometic is the MLS of choice I tend to believe, and we've got them in many blown/turbo/nitrous apps. BUT I've got no experience with the new Fel-pro MLS stuff yet.

-Joe Smith
Lukovich Racing
 

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I have only done a couple with the copper but I silicone around all water passeges and have never had a leak out side or in but :WGAF I have been told the MLS are vey good BUT if you do blow a gasket they are just steel they glow red hot and become a blow torch that WILL torch the block and head very nasty with copper blow gasket's are very few and you just put a new gasket on and be done

Lot's of way's to skin a cat just need to find what work's best for you, remember everything work's until it don't
 

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Mixed results on MLS and coppers.. Some will blow head gaskets with either or.. Best bet it to try MLS first since it will need nothing more than the heads and block to be surfaced.. If they fail move over to a copper with o-rings.. If the coppers are used first you will need to take a lot of steps (maybe new sleeves in some cases) to go to a MLS gasket. I use coppers and never had a problem with them blowing. Only problems I have seen is water leakage (aluminum block sleeves sit around .005" above the surface of the deck).. I have used everything under the sun for sealers and all leak with time. Only thing that works is the silicone you by over the counter at an ACE Hardware.. Use very light coats and becareful around the sparkplug cooling holes. Around a .005 to .010" thickness is more than enough. If it squeezes out the sides its too much.. Hope this helps..
 

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Monty when you use the silicone on the Copper Head Gasket's do you still use something like Copper Coat? I've never used Copper Head Gasket's before and would like to get it right the first time. Thank's.
 

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fn4ever1 said:
Monty when you use the silicone on the Copper Head Gasket's do you still use something like Copper Coat? I've never used Copper Head Gasket's before and would like to get it right the first time. Thank's.
No I clean all the surfaces with lacquer thinner (or any type of degreaser that doesn't leave a residue) and apply a think coat around all the water holes front and back side.
 

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What about yama-bond? We use it with the cometics and never a blown head gasket. We even reuse the gaskets time and time again with no problem. I aint no big dog but it is working for my low budget junk.
 
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