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This is an old post but I am trying to adjust the valve on top of my po triplex filter housing. It is set at 4500 from the factory and I would like to adjust it to 3300. It is a Capitano block. The link posted above referring to page 38 no longer works. Does anyone have a tech manual that...

Does anyone know what is missing from the head of my 1st stage valve cover? It is the threaded hole in the upper left of the valve cover. It doesn't seem to show what should be there in the service manual. I have been searching the web for any images of the Capitano block and can't seem to...