Which Head Gasket to use?
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Northstar Engines and System Technical Discussion Discussion, Which Head Gasket to use? in Cadillac Engine Technical Discussion; Looking for input or suggestions on what brand of head gasket to use. Stock from GM, Cometic or something else? ...
  1. #1
    97 STS is offline Cadillac Owners Member
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    Which Head Gasket to use?

    Looking for input or suggestions on what brand of head gasket to use. Stock from GM, Cometic or something else?
    97 N*.

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    sipur is offline Cadillac Owners Member
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    Re: Which Head Gasket to use?

    go to http://www.autopartswarehouse.com/ and chek The $$

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: Which Head Gasket to use?

    Never used a Cometic gasket in a N*, but we use copper/stainless sandwich head gaskets in marine Olds 455 conversions and have never had a failure. Pricey but good insurance. One of our GM techs may have some experience with Cometic/N*.

  5. #4
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Which Head Gasket to use?

    Quote Originally Posted by 97 STS View Post
    Looking for input or suggestions on what brand of head gasket to use. Stock from GM, Cometic or something else?
    97 N*.
    I am aware of several people that have Cometic head gasket in Northstars. I have never had one in my hand yet. I have one of my customers that is in a current build. He said that he is going to apply some hylomar to parts of the gasket. The stock 3.6L head gasket are MLS and they have a coating on the gasket around the coolant passages. I think it is Teflon, but I was told that is the coating FelPro uses on the gaskets. I was told that about 20 years ago.

    I honestly can't see if the block had Norm's inserts and this head gasket combination that it would ever fail again. I would seal the Case Halves up with the new procedure. It would cost less the $100 more. Then you would never leak oil or have a head gasket failure. You could pull the engine in 10 years and put it in another car.

    The Big Timesert may work just as well as Norm's, but I have never had one in my hand. GM does not approve of either one.

  6. #5
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Which Head Gasket to use?

    I forgot one thing

    The 4.4L S/C Northstar uses a MLS type gasket.

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