Ok so I bought a supposedly built 3tc motor today and popped the tapper cover and found double valve springs which was a good start. Other mods so I have been told are o/S valves, cam , springs , porting, has a weber 32/36, and also he said its been over bored to fit 22r pistons. Has anyone ever heard of this or is this guy on crack??? I thought that 89mm was the max for a 3tc. Any info would be great Guys.