If you go to http://www.osengines.com/history/ostimeline04.html you'll find two photos of the H60, one first made in '66 and the other in '68 but it seems they've used the same photo for both engines so I have no idea what difference there is. I've got the '67 Max H80 version with the twin plugs and it's a very nice engine. Mine was new when bought at a club auction so it was run in very rich for about an hour because of the rings. It starts and runs extremely well on zero nitro fuel so I can't see why the H60 would be any different. The exhaust baffle isn't needed, just take it off and fit a muffler.