TwinTurbo.NET: Nissan 300ZX forum - If you Helicoil it, you should ensure it is drilled square
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Subject If you Helicoil it, you should ensure it is drilled square
     
Posted by LitlElvis on June 13, 2022 at 12:52 PM
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In Reply To intake manifold bolt took some threads w/ it! help posted by devsdead Z32 on June 12, 2022 at 02:52 PM
     
Message to the gasket surface and also tapped square. If you don't do this, the bolt will be a beotch to install.

I end up rejecting cores with poor Helicoil installs all the time. Once it's crooked, the only way to fix it is with a Keensert, and it's just not worth it when there are so many cores that are not mangled.

Here's a nice example of a crappy Helicoil install:

     
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