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  1. #1
    Hydrotherapy's Avatar
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    two part question..happy hoils guys

    on removing my head 13r 05 to be skimmed i was having a close look and clean up when i noticed the spark plug mounting bosses on #3 were approx 1.5mm higher than #1 #2..assumed this at first to be due to comp being down on #3 due to heat ect.. then i cc the domes and found #3 still different..this is only again due to the heat problem but can some one clarify why spark plug higher in head and dome cc diffrent not just cc different..

    2nd part question...

    removed the cat tem sensor and blanking off does any one know the thread size..1/4 npt rings a bell but unsure..

    once again happy new year to all


  2. #2
    steach's Avatar
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    Not sure on #1.

    The thread is M10x1.25. I found an automotive oil plug worked to plug the hole.

  3. #3
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by saltygpr13 View Post
    on removing my head 13r 05 to be skimmed i was having a close look and clean up when i noticed the spark plug mounting bosses on #3 were approx 1.5mm higher than #1 #2..assumed this at first to be due to comp being down on #3 due to heat ect.. then i cc the domes and found #3 still different..this is only again due to the heat problem but can some one clarify why spark plug higher in head and dome cc diffrent not just cc different..
    I use a larger cc head on #3 and noticed the same thing. I think its because its a higher/wider chamber.

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