Happy 4th all.... I have the 350 out of my 70 Skylark. There is a small bolt screwed into the block near the starter. I didn't know what is what for so I removed it to investigate. It puked coolant. What is the purpose of this, what appears to be, an extra hole in the block? Would it be a good place for a coolant gauge sending unit?
Sounds like you removed a block drain plug, if so then no that wouldn't be a good spot for a sending unit because that wouldn't be the hottest point to take an accurate reading from. Put it back in and treat it like a sore dick and don't eff with it. :eek2: Derek
Some engines had a coolant drain plug. Doubt it's big enough for a sender but you can try. I would still keep a sender at the manifold as it will measure both sides as they mix and when the thermostat opens. That one by starter will mostly just read one side
