[wuzerk]

I did some testing on the British In line thermostat system today and compared it with the Chevy 'stat.
The problem with the British one is that he has drilled a quite large bleed hole in the thermostat when it does not need a bleed hole as there is one built in on the edge of the opening plate! The Chevy 'stat has the same built in hole so does not need an additional hole either which I found out the hard way! This means of course that too much water is bleeding through to the rad lowering the available temperature. The problem is how to block up the unnecessary hole?
not enough room for a pop rivet so I suspect soldering is the only way to block it.


There are no problems caused by leaving the original early opening stat in position. The whole point of my experiments was how to attain a good running temperature without having to remove the original.