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  1. #1
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    Threaded holes in promax heads

    Can anyone tell me what the threaded holes below the second spark plugs in these heads are used for?
    Attached Thumbnails Attached Thumbnails IMG_20220112_154758536.jpg  

  2. #2
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    I can't, but that is a clean motor. That little Allison should fly with that jewel on the back.

  3. #3
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    Temp senders/sensors?
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  4. #4
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    Temp sensors was my first thought, but the holes are about 1/2" dia. I've not been able to find any sensors that size.

  5. #5
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    Place for some type Mercury special tool used during factory construction or the casting of the head???

  6. #6
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    Blank threaded hole used to mount the heat activated valve that was used on carb motors.It vented the carb bowls or restricted air to them to richen the mix before the motor warmed up...not used on efi motors,Chris

  7. #7
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    Thanks. Very good information.

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Chris Carson's Marine