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The size of the newer reversing valve is perfect Chuck. As George said, it looks like is was designed as part of the engine. Bill
Chuck - looking at your pics of the valve (Post 174) you don't have much material to get a seal but do you not have the width on that first land between linkage fixing point and the first groove to place a 1mm section O ring? Given the right dimensional fit that should cure any leak coming from the linkage end.Re the rotary reversing valve - they can be difficult to get a perfect seal but lapping both faces help and ensuring that the central pivot is truly square with the faces is vital. On the last one I made I used an Oring, not just to give a seal on the pivot but also to give the necessary tension on the faces. Hope that's not teaching granny Regards - Tug