OK, Chubbysuncle, I've got the same related question...The Japanese Engine doesn't have a pin in the top of the Crank Case or Head...There's a notch in the top of the cylinder sleeve, If I line it up with the Casting Line, the exhaust port pretty much lines up centered with the exhaust outlet on the block, with a little sleeve showing on both sides...Is this how it looks if you line it up with the pin on the taiwan engine??? I'm going to try taking pictures of it tonight...