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  1. #1

    stock head milling ?

    tried using the search first and found some answers but not the one i was looking for. i have an 05 1300 and want the compression at arround 140-150 psi how much are you guys having milled off and what was your psi.


  2. #2
    African-American
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    been wondering the same thing

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    WATER WOODY's Avatar
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    Quote Originally Posted by steven1300r View Post
    tried using the search first and found some answers but not the one i was looking for. i have an 05 1300 and want the compression at arround 140-150 psi how much are you guys having milled off and what was your psi.
    Most riders are at sea level and there is a 'standard' cut,but for higher elevation applications,these cut specs will change.Call Lowell Horning or Jims Performance to get your head done.You will lose approx. 8 psi every 1000' you go up.

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    Moderator RX951's Avatar
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    correct me if I am wrong also, but I beleive .020-.022 is taken off just to get near the lip band on a 1300 for 142-5 psi at sea level. Becareful taking too much off as the squish band will need to get recut for proper squish....

    One thing to note on the 05 up non-powervalve motors
    http://greenhulk.net/forums/showthre...ll+compression

    We've got gurus here that will chime in.

    Lowell Horning is our forum guru resident that cuts heads/ports/build motors
    Jim's Performance is another forum guru resident that cuts heads/build motors
    WFO performance is another forum guru resident that builds GPR powerplants

  5. #5
    Pistonwash's Avatar
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    About .020 knocks off right at the lip of the squish dome..if you go past that, you will mess up your squish. It is safe to have a machinist mill .020 and it bump the compression to around 140lbs. cranking pressure @ sea level.

    I have had many of them done this way...and it's cheaper than buying a new head.

  6. #6

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    I'll be sending my head to Jim in Feb, gonna run 150PSI setup

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    Flying Scotsman's Avatar
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    Sweet I want to see 75mph

  8. #8
    so milling the stock head will still have the required lower compression on number 3?

  9. #9
    Pistonwash's Avatar
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    Quote Originally Posted by Pale Rider View Post
    so milling the stock head will still have the required lower compression on number 3?

    Yes, because the dome volume is diiferent in each individual dome, not the decking. It just raises compression across the board.

  10. #10
    African-American
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    .020 inch ?

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