head gasket
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head gasket

  1. #1
    Senior Member flat screwd's Avatar
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    Default head gasket

    I am just about ready to assemble my new motor and was curious to see what others thought about the felpro wire lock gaskets . In the past I used o ringed copper but it seem most guys are using MLS gaskets . When I purchased the wire lock gaskets I was unaware the the heads need to be machined so the reality is that I saved nothing by using these over o ringed copper.

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  3. #2
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    Here is total what I know:
    I always O ringed the block and never the heads. I found the best sealing was sticking the O ring .020 up. I know some guys are gonna fall over reading that but it is true.
    Blown alcohol I would never consider a MLS gasket. But that is just me.
    Now I have 2 blown gassers running the Fel Pro MLS gasket and no issues at all.
    In fact never had a head gasket problem of any kind.

    I am not familiar with this wire lock gasket. I will read up tho.

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    Fiat, Are you using the MLS gasket with the o-ring

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    http://www.summitracing.com/parts/FPP-1075/
    This is what I have used. Comparable to the Cometic I assume.

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    "Loc Wire head gaskets require machining a special receiver groove into the cylinder heads by a skilled machinist. Complete instructions are provided with each gasket."

    Ok now I got ya. Damn if I would do that. Might as well do O ring and copper if that is the case. Everyone's bitch with copper has been sealing the water.
    I don't know if it is luck or what....but I clean all surfaces with lacquer thinner, let it dry.....then apply ONLY...Permatex Ultra Blue Silicone seal around anywhere there is water. Apply to block....then put head gasket on...then apply to head gasket...then install head.
    NOT Ultra black...or ultra grey....although I have no idea why..but when I use that stuff I get leaks.
    Works for me.

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    i'm back!! 1QuickCP's Avatar
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    o'ring and reciever groove heads, run the flatout RCC copper gasket with the coating, they never leak water period...best gasket I have ever found. the coating is a silcone/rubber stuff that will not come off and seals every nook and cranny of the deck surface. pops right off reuseable..ect ect..

    copper oring reciever groove combo will hold ANY boost you can put to the motor until the clampload of the studs give up. Before this gasket I panograph cut rubber o ring grooves around the water passages in the head and the block,thus every water port had a total seal aganist the copper gasket on both sides. Major pita tho. flatout rcc gasket ended this process. the felpro 1093 is also a very very good gasket in mild boost apps as well. MLS ? eh dont like um..imho

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    Those sound pretty good. Just looked and Summit has those for $75 each.

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    I tell ya fiat the rcc is a amazing gasket..after ya torque it down you can see a little "bead" of the coating squished out all around the edges..take it off and it goes back the way it was. I've run 1093 at 18 psi gas with zero issues on bowtie or dart blocks,but copper is best.

  11. #9
    gn7
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    Word of caution about the LOCK WIRE Felpros. Once you cut the head for them, it a done deal. You have to keep running those gaskets. They will hold back damn near anything. The Outlaw 5.0 guys love em. they are in fact an o-ring gasket. But you are stuck with them for life. The groove is the wrong size and depth for regular o-ring wire. And it requires a machine shop with a BHJ ring jig that is dedicated to cutting the groove for those gaskets. And the gasket isn't cheap. Just be aware.



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    Always used solid copper gaskets. No Orings, the cylinder liner sticks above the deck .005 and embeds in the copper. Never had a problem even at 30# boost.

    High temp silicone around the water ports and it has worked great for me.

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    I think I could run more boost but it's a real hand full right now

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    Quote Originally Posted by 1QuickCP View Post
    I tell ya fiat the rcc is a amazing gasket..after ya torque it down you can see a little "bead" of the coating squished out all around the edges..take it off and it goes back the way it was. I've run 1093 at 18 psi gas with zero issues on bowtie or dart blocks,but copper is best.
    I will try those. I knew someone made a copper with a silicone bead on the gasket (which I was told did not work) but was not aware of these.

  14. #12
    gn7
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    Quote Originally Posted by Unchained View Post
    Always used solid copper gaskets. No Orings, the cylinder liner sticks above the deck .005 and embeds in the copper. Never had a problem even at 30# boost.

    High temp silicone around the water ports and it has worked great for me.
    Somebody else on here, can't remeber who, was dead set against Cometics. Could never get them to seal, leaked water, etc etc. Only ran copper heads gaskets with no o-rings. Turned out to be a Kieth Black alumn block with the liners protruding above the deck. That along with Cometics do not mix



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  15. #13
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    I have and do run copper. I have and do run Cometic.
    My opinion is as follows:
    Copper
    PROS: Tried, tested, proven for years and years. No offense to anyone, but the heads and block should be cut for o-rings and receiver grooves. Again, this is the tested and proven method for whatever boost you want. Silicone around the water ports, and they seal great.
    CONS: Once you cut for o-rings and receiver grooves, you are pretty much stuck with that setup for the life of the engine. You could deck the o-ring out, but you end up with a short deck, or cutting the grooves out of the heads is also possible. This is only about .020. But does take some life out of the heads. Also, when you mill the heads, groves should be touched up, or need to sleeve a cylinder, it is a PITA to match stuff up. Not impossible, just makes your machinist cuss. Also, you will spend another 200 to 300 bucks to machine for o-rings and receiver groves.

    Cometic
    PROS: Also tested and proven for quite a few years. Does not require any special machining to install.
    CONS: Will not handle the boost copper will handle. They are more than adequit for most applications. They can be tricky to get to seal at times. Usually a surface finish function. Silicone on rail ends helps.

    Both "are reuseable". I reuse copper. I don't reuse cometic. Cost is about the same (for gaskets). To each is own.
    Both are excellent when properly installed and used.
    Wags
    Last edited by wagspe208; 10-11-2010 at 06:42 AM.

  16. #14
    Senior Member flat screwd's Avatar
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    Thanks for the input. I think Im just gonna send the wire lock back and just do what I know works ,O ringed copper . You know I just dont know what felpro was thinking . Trying to reinvent the wheel with the same amount of effort. Nothing gained.

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