As most of you know I'm dialing in my OSMaxIII for Brodaks this year. This engine has two long head bolts that fasten the head to the case and 4 smaller ones that hold the head to the jug. I'd like to change them out for cap type fasteners instead of the phillips type. Does anyone know what size metric fastener they are? They don't match up to anything I have in my fastener stash. Thanks,Skip
BTW I changed to a chicken hopper type tank and reduced the venturi size 15% , the plane is flying well now and the inverted speed is pretty close to upright speed. The engine didn't like the .308 original venturi.