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Putting acc. hole in head?

Discussion in 'The Garage' started by RingMaster4x4, Oct 18, 2005.

  1. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I bought a Serpentine belt setup my SBC and I need two more holes in the passanger side head. there are flat spots where there would have been holes. So the question is do you think it is ok to drill and tap two more?
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    how many bolts do you already have in the brackets if you have a good number in there already you will be fine leaving them out
     
  3. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    only one I am sure I need at least one more.
     
  4. 1979jimmy350

    1979jimmy350 1/2 ton status

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    you could drill and tap the head but you need to be very careful not to break into the water jacket or even worse the combustion chamber. Just be carful not to drill to deep
     
  5. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    yeah I am only going to go 1/2 or less
     
  6. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    no one else has any word of waning?
     
  7. TJS

    TJS 1/2 ton status

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    You want the tap to be as perpindicular as possible. I think MSC has tap guides. A tap guide is sort of a bushing that is machined flat on both ends and allows the tap to fit through the bushing (with a little interference)and be used as a guide. I have made a couple on the lathe instead of buying them. HTH.
    T.J.
    www.tjsperformance.com
     
  8. HarryH3

    HarryH3 1 ton status Author

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    If the only thing behind the area is the coolant jacket, then you don't have much to worry about. If you get into it, just coat the bolt threads with Permatex before you install them. It works fine for the water pump bolts. :wink1:
     
  9. PsychoticDeadGuy

    PsychoticDeadGuy 1/2 ton status

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    i think 1/2" is not deep enough to get a tap deep enough to have enough threads to really bolt and acc. bracket on...just my honest opinion
     
  10. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    let me find a picture
     
  11. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    ok the heads look like these the one on the left is the one I need to drill. my heads have two rased flat spots just like these off ebay.

    [​IMG]
     
  12. xpndbl3

    xpndbl3 1/2 ton status

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    typically if you're interested in doing this type of drilling and tapping, i'd let a machine shop do it who has experience in this type of thing. Otherwise you risk drilling a bolt hole at an angle, or worse cracking a head.
     
  13. kgblazerfive

    kgblazerfive keymaster Premium Member GMOTM Winner

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    Don't do it its not going to work. You probally only need one hole and you don't even need that. Never did it on mine and my serpintine setup has yet to fall off my motor. Read testimonies of guys who have tried and they want to know how to fix a leaking head.
     
  14. hero

    hero Registered Member

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    This may seem dumb, but why not just modify the bracket. Can you weld a piece of steel onto it that you could get to line up with one of your existing holes? That seems easier than drilling and tapping the head.
     
  15. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    the bracket is aluminum and there is only one hole on the passanger side head
     
  16. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    I second this aproach why not make a bracket that you could take back to a manifold bolt even
     
  17. big4x4ride

    big4x4ride 1/2 ton status

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    i drilled some holes in a set of camel hump heads that didnt have the accessory holes, wasnt a problem.
     
  18. jhellwig

    jhellwig 1/2 ton status

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    I agree with the guy above me. Several guys I have talked to have had to drill holes in heads that don't have accesory holes.
     

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