There is what appears to be a brass fitting between the 2nd and 3rd spark plugs on the driver's side of my 454. Is a fitting for a mechanical oil pressure gage?
Now for the next question. If it is for a water sensor, is it electrical (like a thermocouple or RTD) or is it for a mechanical temperature gage? I have factory SS gages but they aren't connected yet. I have an aftermarket mechanical temperature gage and it is connected to the intake near the water neck.
If your running an aftermarket intake. No need to even use that spot on the cyl. head, use the spot on the intake thats for it. Thats what I did. Just used a plug and thread sealant to seal that hole.
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