Originally Posted by
Twellsie
i am struggling to understand this a little, valve seat i presume is the area that the valve sits into which is cast into the head? when you say fall out, is it a part of the head that breaks away or is there some kind of insert that sits in there?
When the material around the seat gets hot, it expands and as a result allows the valve to fall out.
The more meterial there is, the heat wont be as high as there is more material there.
Correct me if im wrong Stu.