I've read a lot of reviews complaining about the missing threads in the mounting holes. I have my own die set but I didn't even need it. The alloy is soft enough that the screws are self-tapping, even if they aren't self-tapping. So you can buy this manifold replacement based on other complaints/concerns. You need a Torx T30 bit. I recommend the socket style as you need some leverage for it. You should also be able to do this without a vise or clamps of any kind. I could only rotate it by holding the distributor in my hand.
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