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Exhaust bolt size on 2F

Discussion in '40- & 55-Series Tech' started by petescoffee, Jun 3, 2003.

  1. petescoffee

    petescoffee

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    :dunno:On my 75 2F I have 2 striped threads both on the head and bolts for the exhaust and intake. They are the 2 outside ( 1 at the rear and 1 at the front of the motor) bolts. These 2 are different sizes than the otherbolts and studs. Anyone know what size they are? I need to retap or heli coil them. I am trying to figure out what size. 10 or 11 mm and what pitch 1.25 or 1.5 or what? Their is not enough thread on the head to get an accurate reading and the previous owner used the wrong bolts so they are know help.
    Why can't these darn bolts be consistent.... ???
     
  2. cruzer

    cruzer

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    Let me check this out for you tonight...i have two bolts i just bought from yota and i have the head off my truck so i will check both...for some reason i think the bolts i got are incorrect for my head but anyway i will let you know all about it tonight when i get home and check it out for you...i ended up with one of the studs being stripped and now i am rebuilding the engine LOL!

    Stew
     
  3. petescoffee

    petescoffee

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    Thanks,
    Every bolt is different. The head bolt threads in the block were the hardest to find tap for. I had to special order the darn thing.
     
  4. willow

    willow

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    Pete: 2F outside exhaust manifold bolts are 10mm x 1.25, I just checked, my exhaust and head are off, waiting for valve regrind kit
    willow
     
  5. petescoffee

    petescoffee

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    Thanks for the info. :beer: