stacking headgaskets
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stacking headgaskets

  1. #1
    Senior Member lbhsbz's Avatar
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    Default stacking headgaskets

    My machine shop said that since the block has already been decked...and it's a little on the low side (about 0.005 outta the hole he said) decided to not deck it. While I was in the process of doing my cleaning and pre-assembly measurments I discovered that the deck is way to rough from a previous resurfacing to even dream of sealing against a head gasket...looks more like the surface of a file. It'll take about .007 or .008 to clean up, which will leave me about .013 or so out of the hole using calculated numbers. Actual measurements and rocking the piston in the bore yeilds about .0015-18 out of the hole.

    With a .041 gasket, the quench is around .023"...which won't fly. With an .051 MLS gasket, this will set the quench at around .033 or so, which is a still a bit tight.

    I was kicking around the idea of grabbing a 3rd gasket and using layers off of it to make a total thickness that would get my quench to .040 or slightly more.

    This seems halfway hack to me though. What says the PB brain trust?

    Option 2 is to find yet another block.
    Last edited by lbhsbz; 08-18-2010 at 09:51 AM.

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  3. #2
    Some guy obnoxious001's Avatar
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    Option 3 might be to use a thicker copper head gasket,, or get Cometix to make up whatever thickness head gaskets you want to give you proper quench.

  4. #3
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    Option 3 might be to use a thicker copper head gasket,, or get Cometix to make up whatever thickness head gaskets you want to give you proper quench.

    I guess I'm asking if making up this distance using the headgasket is a good idea. I generally like to keep gaskets as thin as possible because the more surface area exposed to the chamber, the bigger the beating the gasket takes. I'm not opposed to getting another block if theres any question as to the integrity of running a .060" head gasket vs a .041 head gasket. I've always run the .041s so I don't know.

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    Senior Member Blown to the Bone's Avatar
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    you could machine the deck of the pistons !

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    Senior Member alkyexpress's Avatar
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    Quote Originally Posted by lbhsbz View Post
    I guess I'm asking if making up this distance using the headgasket is a good idea. I generally like to keep gaskets as thin as possible because the more surface area exposed to the chamber, the bigger the beating the gasket takes. I'm not opposed to getting another block if theres any question as to the integrity of running a .060" head gasket vs a .041 head gasket. I've always run the .041s so I don't know.
    I have run a.060 copper head gasket ( with o-rings ) on a496cid blown alky motor at 17 psi of boost No problems, ...........E

  8. #6
    Senior Member lbhsbz's Avatar
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    Ok, I'm not O-ringed.

    Can someone please give me the copper vs MLS lesson now?

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    I like copper. Just silicone around all water ports. Ive seen too many mls failures at around 20 psi boost. Don't know why they became so popular .You can run copper without o-rings up to about 20 psi that's just what Ive done hope this helps Titan makes one with a o-ring inside the copper don't trust the print-o seal use silicone on the water ports.

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    Senior Member jockorace's Avatar
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    Quote Originally Posted by pisston in the wind View Post
    I like copper. Just silicone around all water ports. Ive seen too many mls failures at around 20 psi boost. Don't know why they became so popular .You can run copper without o-rings up to about 20 psi that's just what Ive done hope this helps Titan makes one with a o-ring inside the copper don't trust the print-o seal use silicone on the water ports.


    Yep, what he said. I've had good luck with the SCE ICS copper head gaskets on my blown deal, with or without block o-rings. They make a .041, .050, .062, .072 and even a .080 thick gasket. Jocko

    http://www.scegaskets.com/Chevrolet/396-454-Mk-4-Big-Block/ICS-Titan-Head-Gaskets/ICS-Titan-Head-Gaskets-p6631756.html

  11. #9
    Senior Member Bruise Brothers Dad's Avatar
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    Quote Originally Posted by Blown to the Bone View Post
    you could machine the deck of the pistons !
    Since our buddy Phill moved back to New Zealand finding a good machinist is getting harder......Sparks
    Need help finding this 1973 Sanger 18'6" bubble deck mahogany bottom and stringers I was living in Pomona when I sold her in 1979. Just wonder if she still exists

    Update Found my old Sanger 12/7/14 in Reno.

  12. #10
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by Blown to the Bone View Post
    you could machine the deck of the pistons !
    I'd rather not.

  13. #11
    Senior Member jetboatperformance's Avatar
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    Pat maybe give these folks (Cometic) a try like Barry suggested , great product and super people to deal with Tom
    http://www.cometic.com/

  14. #12
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    i run sce titan copper gaskets at .080 due to my domes and have never had a problem one

  15. #13
    AKA Blownjet 468 Blowncat 509's Avatar
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    I did a motor for a guy awhile back that the pistons were out of the deck
    around 32 thousands, used a cometic that was 72thou . it's still running
    very well for the guy, although he's only running around 7 or 8 lbs. boost.
    don't see a problem doing the same in your deal(altho they ain't cheap,
    'bout 160.00 each)

  16. #14
    Senior Member GT Jets's Avatar
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    I would not "layer" gaskets, but have no problem with a copper or Cometic gaskets...

    Layering would be asking for trouble doubling your chances for a catastrophic failure IMO...
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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