CRAP! stripped bolt hole in cyl head for intake manifold bolts

Discussion in 'Engine Topic' started by need-for-speed, Mar 4, 2017.

  1. need-for-speed

    need-for-speed Veteran Member

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    Two of the holes for the intake manifold bolts are stripped !! :smash:

    SBC Edelbrock heads. I'm assuming (hoping praying) that I can repair them with helicoil ot Timesert. Based on the configuration/location of these tapped holes I don't see a need to remove the heads to repair. Just the intake manifold. Can anyone advise please?
     
  2. slayer021175666

    slayer021175666 Veteran Member

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    Maybe someone will have a better idea but....
    I would leave the manifold on for the helicoil work. It will keep poo out of the lifter valley and it will guide your bit angle better. Try not to go all the way through the head. That too will drop poo into the engine.
     
  3. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    If the heads are built like stock...The bolts go through the head and into the lifter valley.
    They aren't blind holes. (Which is why oil seeps up through them sometimes.)

    You will need to repair them with the intake off just to clean up afterwards.
    Grease on the bit and tap helps catch much of the glitter.

    Good Luck!
     
  4. Green hornet

    Green hornet Veteran Member

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    I would repair them with the intake off that way you make sure no debris is left behind. Put a rag in the valley to catch as much debris as possible.
     
  5. Mike N

    Mike N Administrator Staff Member Lifetime Gold Member

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    Which hole or holes are stripped? I think only the middle two holes on either side are pass thru holes, the ends are blind holes. You can verify this by using a small pick or screwdriver and see how far it goes into the hole.

    Blind hole- leave the intake on but be sure to use a bottoming tap to cut far enough down for the helicoil.
    Pass thru- pull the intake.
     
  6. 70-camaro

    70-camaro Veteran Member

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    Run the shop vac as you drill also.
     
    Edem_Alive likes this.
  7. slayer021175666

    slayer021175666 Veteran Member

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    Ya. Sorry for assuming. I just thought for sure you meant the ends holes. You couldn't even get a drill in the center holes with the manifold installed. It is the center holes that pass through. The end holes are blind. No problem drilling the end holes if the Eddys are like stock. Go check out some pictures of your exact heads on the net to make sure! :)
     
  8. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    Ditto, not worth dicking around, intake off and if you are worried the drill won't follow the hole perfect,
    put a long bolt in the next hole as a visual aid.

    Good luck.

    .
     
  9. Dave Nelson

    Dave Nelson Veteran Member

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    This is the way.
     
  10. rocket dawg

    rocket dawg Veteran Member

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    SBC Edelbrock heads? As in aluminum? better read up on tapping aluminum, you could easily strip out the hole with the tap as aluminum tends to plug up the threads. If they are cast iron, not so much to worry about. If you do mess them up, remove the head, send it out to be repaired ( aluminum heads can be repaired )
     

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