Originally Posted By: 70Nova
same spot on mine. Radiator is new, 3-row.


Mine creeps up like that too. I've learned to ignore it.

Melon: Mine is the original pulley on the water pump. I think it's where the temp sensor is located in my (and 70Nova's) case. False reading.

There's a couple of thermostat housings on Ebay with the port in them from later 250's but they're pricey. My housing has the boss for the port but wasn't drilled and tapped. I can tap it and put it there if I wanted.

Another option is a thermostat spacer with a port like this: http://pitstopusa.com/i-5069394-joes-thermostat-spacer-1-2-npt-ports-gauge-port.html

I'm not a huge fan of that one, though. Just my preference.

I've just opted to ignore it.