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yes I was thinking of that also. Some of these o-rings can handle up to 500 F. However I am not sure what would be the tempature inside the chamber on a model hit and miss engine?

Thanks all. No I am not referring to the valve stem. The actual sealing between the valve face and the valve seat. Thinking instead of making a 45 degree angle on valve and seat, I make the valve margin a little wider and make a groove on it for the o-ring. Ron

This is regarding 4 cycle hit and miss engine (.75" bore with valve face dia .25") I know some people have used o-ring instead of piston ring with good results. I am wondering if the same is possible with o-rings on the valves to seal the leak? I know the process of sealing the valves and angles...

Nice running engine, but isn't this the exact duplicate of Jerry Howell Power house engine? Why do you call it your own design?