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Thread: Head Gasket thickness selection

  1. #11
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    Default Re: Head Gasket thickness selection

    hey if you measure the stock head gasket after it has been pressed its actually a lot thinner the the 1.2mm hks, keep that in mind, and ya its better to resurface both head and block when going with a mhg, found that out the hard waynow i got my head resurfaced and will get my block resurfaced this weekend, will post pics soon

  2. #12
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    Default Re: Head Gasket thickness selection

    Stock composite gasket is 1.37mm compressed.

  3. #13
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    Default Re: Head Gasket thickness selection

    Quote Originally Posted by rayall01 View Post
    If the stock gasket is 1.37mm, then the HKS is already to thin for stock surfaces. Since you have already machined the head, (and hopefully the block as well), You will need to get a much thicker gasket to maintain the correct compression ratio, or you will get detonation issues. And if you haven't done the block, then don't even think about using a metal gasket, because it will not seal.
    So i'm planning on using Fel Pro's MLS (multi-layer steel) gasket, and by what your saying i need to resurface the block as well or the gasket won't seal? Could i just clean it up with ..say..sand paper and a scraper? I have pulled the head off on my car bc of a BHG but im not looking forward to have to remove the block.
    A sooner than later reply would be helpfull. Thankyou

  4. #14
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    sorry to ask this but how the fuck do you measure a block and head???!

    im using my dads ancient carpenter tools.so excuse my lack of knowlege for the newer tools
    "all the while thinking "when the supra is at 100%, I'll smoke this car in reverse, up hill, with the wind blowing against me"....... thanks for the sig whoever i love it

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  5. #15
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    Default Re: Head Gasket thickness selection

    I use a pair of Digi Verniers.

  6. #16
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    Default Re: Head Gasket thickness selection

    Quote Originally Posted by IJ. View Post
    I use a pair of Digi Verniers.
    oh yea i have one of those...

    takes a sip of gatoraid

    puts bottle down.....well my machinist recommended a 2mm mhg cause my head has been decked before so i just going to listen to him.
    "all the while thinking "when the supra is at 100%, I'll smoke this car in reverse, up hill, with the wind blowing against me"....... thanks for the sig whoever i love it

    My favorite import muscle the mk3 supra
    My favorite domestic muscle 67-69 plymouth Barracuda

  7. #17
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    Default Re: Head Gasket thickness selection

    just put a mhg hks 1.2 mm in my 87 supra running at 15 lbs of boost for 1 month now no problems .not using any kind of drugs [just budlight].

  8. #18
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    Default Re: Head Gasket thickness selection

    Quote Originally Posted by Ice View Post
    So i'm planning on using Fel Pro's MLS (multi-layer steel) gasket, and by what your saying i need to resurface the block as well or the gasket won't seal? Could i just clean it up with ..say..sand paper and a scraper? I have pulled the head off on my car bc of a BHG but im not looking forward to have to remove the block.
    A sooner than later reply would be helpfull. Thankyou
    No, unless you mean you're going to do what I did. Read my build thread.

    http://www.supramania.com/forums/showthread.php?t=92669
    Showing the world, even poor people can own a Supra!

  9. #19
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    Default Re: Head Gasket thickness selection

    Quote Originally Posted by jb dock View Post
    just put a mhg hks 1.2 mm in my 87 supra running at 15 lbs of boost for 1 month now no problems .not using any kind of drugs [just budlight].

    That's a great idea...just pull a number out of your arse and use it. Base your recommendation on a whole month of use too. Highly credible post sport.

    Since you appear to be new guy, these kind of posts are not tolerated in the Tech section. Especially one that has potential to cause damage.

    To keep stock compression, the MHG needs to be at a thickness that will make up for the material removed from the block and head decks. Unless you know what you are doing, increasing cylinder compression and increasing boost is a sure fire way to blow your engine.
    I will no longer respond to tech questions via PM. If you have a question, put it on the forum so everyone benefits from the answer.

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  10. #20
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    Default Re: Head Gasket thickness selection

    Okay, PLEASE forgive my ignorance, but from the way I read this, there are two choices....

    1: Pull the head apart, inspect the head and block for warping or damage, take the head to a machine shop to get it milled if it needs it, measure how much of the head was shaved, jump online, order the appropriate MHG or HG with studs (if they are even in stock!!!), and wait for it to ship? (And I'm not even talking about how to mill the BLOCK yet, like taking IT out or trying to mill it in the shop...)

    2: Buy an MHG ahead of time with more width than stock (like 1.5~2.0mm) with studs, pull the head apart, inspect the head and block for warping/damage, take the head to machine shop to get it milled irregardless of damage to match the amount of the MHG you just bought (equal to what the head and block had to be milled to to match the width actually), and them reassemble everything.

    Since this is a HG for Dummies thread, what exactly is the recommended way of doing this, factoring time constraints and cost of this endeavour? For some of us, we're using our MKIII's as daily drivers, and as such can't be down for weeks at a time doing all this. For others, they won't/might not have the garage/shop space to take up for weeks at a time doing this. As a preventative measure, it makes perfect sense getting the HG done NOW and done RIGHT to avoid any headaches later on down the road, so more people will want to do this themselves or with friends who know motorwork. Or should the newbie just chuck all this and get it pro done and get raped by a stealership/machine shop in the process?

    Again, forgive my ignorance and/or asinine tone. It's frustrating worrying about a BHG and not being able to do much about it but let it happen when you can supposedly prevent/postpone it.

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