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Thread: what thread size for water injection brass plug?

  1. #11
    Inactive Member grand600intercooled's Avatar
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    yeah the one I was thinking about is the Pressure switch port sorry

  2. #12
    Senior Hostboard Member JRCivic's Avatar
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    CivicR,

    Yes, the first generation "B" series intake manifolds had a LARGE plug just under and slightly left (driver's side) of the pair of vaccuum barbs. This was deleted in the second generation manifold. These holes were threaded 12mm x 1.50 pitch... just like the lug nuts on your Honda !!!
    If anyone searches the archives, in a thread about B&M fuel pressure gauge installation, you can see my boost gauge connection to this odd port on my FIRST GENERATION manifold. It is a large 90' fitting coming out of the drivers corner.

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