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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    You bet. I plan to do that.
     
  2. need-for-speed

    need-for-speed Veteran Member

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    Thanks !
     
  3. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    I'm a CNC programmer/machinist. Tapping by hand is the hardest manual machining operation. You absolutely want lube. I recommend Boelube for aluminum tapping/drilling (invented by Boeing). You don't need to ream the hole drilling is more than fine. If you want your tapped hole to come out straight and not be a drunken thread, use a drill press (which you probably don't have) or buy a tapping handle, this is a better route than using a hand drill or a wrench. If you get a tapping handle, turn it 1/4 turn and look 360 degrees around it visually to make sure you are as perfectly concentric to the hole as possible. Keep doing this as you continue going in 1/4 - 1/2 turns. After 2-3 complete rotations, you can do full turns but keep checking. As your tap begins to cut metal, the heat will melt the lube which is normal and the reason you need it.

    I've run 1" drills into aluminum at 250 IPS and 15k RPM, but I absolutely hate tapping xD
     
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  4. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    Also, what 70-Camaro said, and I forgot to mention. After every half to full turn you back the tap out so that you break the chip. This helps prevent tap breakage and binding.
     
  5. 351maverick

    351maverick full time Ebay seller/hustler/car killer

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    I'd run it with two loose bolts
     
  6. need-for-speed

    need-for-speed Veteran Member

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    Great advice. I will do that. I'll get a tapping handle and use your method of 1/4 turn, stop, check concentricity. Thanks for taking the time to type that.
     
  7. Mike N

    Mike N Administrator Staff Member Lifetime Gold Member

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    Let's not confuse the issue with facts.

    :D
     
  8. 70-camaro

    70-camaro Veteran Member

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    download.jpg I was in the parts store and looked at heli-coil kits and they didn't come with a starter tap. If your kit does not come with one I would buy a starter tap (taper tap). It will make it much easier to start new threads. After that run the bottom tap. I hate to keep spending your money but this is a must.
     
    Last edited: Mar 7, 2017
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  9. need-for-speed

    need-for-speed Veteran Member

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    Thank you for the advice. I will buy those if necessary. The money will be well spent. I don't want to feck up these Eledbrock heads (again!)
     
  10. need-for-speed

    need-for-speed Veteran Member

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    I ordered the kit from timesert and it came in yesterday. It came with a bit and tap. I'll be pulling the intake manifold today. Gonna go buy a tap handle today. I also ordered some Boelube paste (for aluminum). Thanks for the tips.

    Question: the included drill bit has a square shank on the end. I assume I can still use that in a hand drill?
     

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