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Thread: Threaded holes in promax heads
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01-17-2022, 07:50 PM #1Junior Member
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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?
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01-17-2022, 09:00 PM #25000 RPM
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I can't, but that is a clean motor. That little Allison should fly with that jewel on the back.
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01-18-2022, 12:14 AM #3
Temp senders/sensors?
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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01-18-2022, 03:15 PM #4Junior Member
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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.
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01-18-2022, 04:57 PM #55000 RPM
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Place for some type Mercury special tool used during factory construction or the casting of the head???
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01-20-2022, 06:54 AM #6Supporting Vendor
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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
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03-01-2022, 08:00 PM #7Junior Member
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Thanks. Very good information.
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