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Thread: head surface

  1. #1
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    head surface

    I have had a couple of people call me and ask what is better on a head once being milled a smooth and shiny surface or not a shiny surface. (YOU DO NOT WANT A SHINY AND SMOOTH SURFACE) you want to leave it with the machine finish surface, With a shiny and smooth surface the gasket has a hard time sealing. Leaving it with the machine surface the gasket seals good, Look at all the after market heads like riva and R&D run your finger nail over the gasket surface on the head and you will see it is not smooth at all, And all the top porters and engine builders you will see that they leave a machine finish. I have milled hundreds of heads and the only way i found for the gasket not to leak is to leave the surface machined and apply some grease on the gasket before i install. You have to remember this is not about what looks better and what shines this is about what works in the real world. Thank you, Jim


  2. #2
    AGREED-- you want a MACHINED FINISH!

  3. #3
    www.2-Stroke-Porting.com
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    Machined, then sanded lightly - with a Sanding Block - to make sure no dings or bumped edges protrude to prevent a good seal. If the head has been shipped, or stored, - check it with a sanding block.

  4. #4
    canadaxp's Avatar
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    Thumbs up

    Do you think we could get a second opinion on this? Maybe from some one with a bit of experience in the topic? Come on...LOL

    Good info. Thanks guys.

  5. #5
    "Hustler" Inkaddict's Avatar
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    Quote Originally Posted by canadaxp View Post
    Do you think we could get a second opinion on this? Maybe from some one with a bit of experience in the topic? Come on...LOL

    Good info. Thanks guys.
    Im saying... If those 3 guys told me I could jump off a cliff and fly... Id be falling as we speak..

  6. #6
    mrbtd's Avatar
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    Quote Originally Posted by Inkaddict View Post
    Im saying... If those 3 guys told me I could jump off a cliff and fly... Id be falling as we speak..
    I would be right behind you.

  7. #7
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    The other thing i forgot to say is some times i will receive a head that has some scratches or small dings in the camber or the squish band area. You do not want to leave any sharp edges you want to sand them because any sharp edge will create heat and detonation, So on some heads i do if i see scratches or sharp edges on the squish band or chamber i will sand the squish band or chamber to get rid of any small scratches or sharp areas. Just paying attention to the details for a little more protection .

  8. #8
    Chine Walker
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    Don't some CNC machines leave a very smooth surface, virtually mirror like??

    jp

  9. #9
    RUNWME's Avatar
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    Quote Originally Posted by Inkaddict View Post
    Im saying... If those 3 guys told me I could jump off a cliff and fly... Id be falling as we speak..
    +1

  10. #10
    3 x 1800 feeding my obsession sconti stellari's Avatar
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    Quote Originally Posted by Inkaddict View Post
    Im saying... If those 3 guys told me I could jump off a cliff and fly... Id be falling as we speak..
    +2

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