Trying too figure out what head gasket i can run on my bbc
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Trying too figure out what head gasket i can run on my bbc

  1. #1
    SUCK MY WAKE Sangster~bbc's Avatar
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    Default Trying too figure out what head gasket i can run on my bbc

    Hello Fellas..i am just rebuilding a mild bbc mark IV 454 just bored to 30 over and im pretty sure it was a virgin before i got bored so the deck is stock aswell,and am going too run gm 049 heads iv heard allot of diff chamber sizes that these heads can be but im just going too say there 122cc and i have just picked up speed pro hypereutectic pistons 693CP +210 dome..
    <How thin of a head gasket can i get away with runing?? trying too boost my comp up alittle as i think i will be sitting around the 8:5//9 mark
    saw some steel gasket that are as thin as 018, i found this one from Mr. Gasket Head Gaskets 1131G, anyone know if i could run that thin of a head gasket with my aplacation, for my mild big block, dont know if cam matters but iv bought comp XE284H cam
    Just would like too atleast get my comp up around the 9:5:1 our 10:0:1 anyway thanks guys

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by Sangster~bbc View Post
    Hello Fellas..i am just rebuilding a mild bbc mark IV 454 just bored to 30 over and im pretty sure it was a virgin before i got bored so the deck is stock aswell,and am going too run gm 049 heads iv heard allot of diff chamber sizes that these heads can be but im just going too say there 122cc and i have just picked up speed pro hypereutectic pistons 693CP +210 dome..
    <How thin of a head gasket can i get away with runing?? trying too boost my comp up alittle as i think i will be sitting around the 8:5//9 mark
    saw some steel gasket that are as thin as 018, i found this one from Mr. Gasket Head Gaskets 1131G, anyone know if i could run that thin of a head gasket with my aplacation, for my mild big block, dont know if cam matters but iv bought comp XE284H cam
    Just would like too atleast get my comp up around the 9:5:1 our 10:0:1 anyway thanks guys
    I assume you dont know what your quench is with a standard felpro...seems they are .042 ish thick. You could get thinner ..about half that with a commetic(sp) IF your block and heads were/are prepped right. I doubt you will find many hypuretic(sp) fans around here. I doubt shaving .020 off will do you a whole lot of good compression wise. It may...or may not help your quench....depending where your at. Good luck...just my .00000000002
    Another Hot Boat refugee

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    gn7
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    Heres your problem. You're making assumptions. Not good when building an engine. If you don't want to deck the block to a specific KNOWN deck height, then you need to either assemble the thing, or at least mock up AT LEAST 1 cylinder on each bank, and measure the "in the hole" distance.
    With hyper pistons in a bore that size you can get away with about .038 total with the COMPRESSED GASKET. I wouldn't go any less.

    So ASSUMING the piston is .20 in the hole, you can run a .018 gasket. Which is a good number for quench. You won't gain much in compression, but that not the goal here. Quench is.

    If you DO NOT deck the block, and you install a standard performance Felpro on a engine with the piston .020 in the hole, you'll end up close to .060 quench, and thats pretty much the absolute max effective quench. Its far from ideal.

    FYI, steel shim head gaskets need to be treated much like Cometics. The block and heads need to smooooth and flaaaat. Also, the gasket REQUIRES sealer. I like GMs 1050026 sealer. BOTH SIDES!



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    SUCK MY WAKE Sangster~bbc's Avatar
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    ok thanks guys ill check too see my quench then ill get back...

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    Default http://www.performanceboats.com/dyno/111594-trying-too-figure-out-what-head-gasket-i-

    Bob, Iv always used Indian head. That dark brown stuff with a paint brush on the lid. But cometic is real strict about installing dry. They told me at the PRI show that I shouldn't use it anymore. I would like to hear your thoughts on why to use the sealer. Thanks.

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    Senior Member Franger's Avatar
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    Quote Originally Posted by MR. KILOWATT View Post
    Bob, Iv always used Indian head. That dark brown stuff with a paint brush on the lid. But cometic is real strict about installing dry. They told me at the PRI show that I shouldn't use it anymore. I would like to hear your thoughts on why to use the sealer. Thanks.
    Question, have you ever had a head gasket failure using the combination you mention? (Cometic and dark brown stuff with a paint brush on the lid)

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    gn7
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    Quote Originally Posted by MR. KILOWATT View Post
    Bob, Iv always used Indian head. That dark brown stuff with a paint brush on the lid. But cometic is real strict about installing dry. They told me at the PRI show that I shouldn't use it anymore. I would like to hear your thoughts on why to use the sealer. Thanks.
    I don't know of anybody that installes them dry. I have never had luck with it. I did run the Felpros straight out of the package, but that was when they had the sticky coating on them. They no longer do.
    Most guys I know use Gasgacinch on them. The very best stuff I ever used was Hylomar, but its a little harder to find, and its expensive.

    But the OP isn't talking about a Cometic, although a Cometic is alot like a stack of stock OEM steel shim gaskets.
    The GM sealer was originally developed to seal the Turbo buick V6 heads.



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    Default http://www.performanceboats.com/dyno/111594-trying-too-figure-out-what-head-gasket-i-

    Franger, I never had a gasket fail, but cometic says not to do it. They said the brown stuff doesn't agree with the coating that's already on their gaskets. That's why I wanted to hear Bobs take on it.

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    Quote Originally Posted by MR. KILOWATT View Post
    Bob, Iv always used Indian head. That dark brown stuff with a paint brush on the lid. But cometic is real strict about installing dry. They told me at the PRI show that I shouldn't use it anymore. I would like to hear your thoughts on why to use the sealer. Thanks.
    Permatex brown stuff. .020 mr gasket steel shim and .012 in the hole. Same gaskets 3 times.
    "A liberal paradise would be a place where everybody has
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    gn7
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    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Permatex brown stuff. .020 mr gasket steel shim and .012 in the hole. Same gaskets 3 times.
    The Permatex brown stuff is very very close to the GM sealer.

    .032 quench? You won't built up much carbon on the quench pads of the pistons and heads.



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