Some thermostats have what they call a jiggle pin in the rim to allow a slight bypass and to vent air.
All the Rover K series head gaskets I have replaced got some holes drilled in the stat and caused no problems.
We are in the process of fitting a Zetec from a Ginetta G20 race car to the Roadster and Spud has a blog on his website,it shows the stat housing on the rear of the engine,the top hose metal pipe has a small vent pipe that returns to the header tank.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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