The threads are simply a bushing that presses into the coolant passage in the head - you will have a core plug on the other head.  These bushings are available new or very easy for a machine shop to make if you can't get one for some reason.
They also came in two sizes, I think 1/4 and 3/8 pipe - confirm for yourself.  If it's the smaller, you can drill and tap it larger but then you would need a reducing bushing, if using the original or stock replacement sender and gauge.  Most aftermarket gauges come with an assortment of fittings for the sender and are pretty universal.


Lawrenceville, GA

Now that I am digging into it, the factory location may not be easily usable. It looks like there was a problem with the threads and it’s been sealed up in a way that makes me reluctant to mess with it.

If that is not usable, are there other options for temperature sensing? Teeing off where the heater control valve - I think I would end up with an unattractive situation. Alternatively, is there an option to replace to heater control valve?


MplsMike
'56 Parklane
Minneapolis, MN

I don't think it's worth it.  The factory location works well enough for a gauge.


Lawrenceville, GA

Hi all,

On my newly rebuilt engine, is it worth putting the temp sending unit at the front of the engine? I see a hole in the Mummert intake. I understand temp reading may be better there than the stock location at the back of the engine.

If it is a good idea, how would I handle the vacuum controlled heater valve that is in that location on the current engine? Would I tee it off for both the sending unit and the valve?

MplsMike
'56 Parklane
Minneapolis, MN