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Thread: Head gasket question

  1. #1
    Slo-Mo-Shun's Avatar
    Slo-Mo-Shun is offline Cadillac Owners Fanatic
    Automobile(s): 2006 STS-V; TopKart Flash 125 Shifter
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    Head gasket question

    After perusing the technical forum and seeing a 20-mile-long thread on Northstar head gasket and head bolt issues, I started wondering about the STS-V.

    It appears to me that at least part of the Northstar head gasket problem might be with the gasket itself, which appears to fail after 80-100,000 miles of trying to maintain a seal against the high expansion coefficients of an all-aluminum engine.

    In the recent Car & Driver, it is mentioned that the new, supercharged 'vette ZR-1 has a 4-layer gasket rather than a 2-layer gasket to help cope with the stress.

    Anyway, I'm wondering if Cadillac did a similar upgrade on the Northstar in the STS-V? I know they reduced the bore to make the block stronger. Coming up with a whole new set of pistons and new block casting is pretty hard core. The resized block would need a resized gasket anyway, so why not upgrade while you're at it?

    Did they and if so, what is the difference?


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  3. #2
    WillySTS is offline Cadillac Owners Enthusiast
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    Re: Head gasket question

    We'll find out in the long run...or I will, since I bought my car, most of you seemed to have leased.

  4. #3
    Jesda's Avatar
    Jesda is offline Super Moderator
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    Re: Head gasket question

    2000+ FWD Northstars have dramatically fewer instances of HG failure.
    2004+ RWD Northstars are 80% new, and the SC versions are even stronger, so I suspect its a total non-issue.

  5. #4
    Eldo1953's Avatar
    Eldo1953 is offline Cadillac Owners Enthusiast
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    Re: Head gasket question

    I wouldn't worry about it. We have only ever seen 1 failure on this site in the newer (2004+) RWD Caddys, and the engine only had a few thousand miles on it so there was clearly a manufacturing defect.

  6. #5
    BMBSALES's Avatar
    BMBSALES is offline Cadillac Owners Enthusiast
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    Re: Head gasket question

    davidstan had one

  7. #6
    Slo-Mo-Shun's Avatar
    Slo-Mo-Shun is offline Cadillac Owners Fanatic
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    Re: Head gasket question

    was it on an STS-V?

  8. #7
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    Re: Head gasket question

    Quote Originally Posted by BMBSALES View Post
    davidstan had one
    yes my first sts v blew the head gasket after i think 1200 miles or so. Dealer gave me new car so no problem. I'm pretty convinced it was rare.


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