I'm going to rebuild my GS550 engine and I found out my valve seats are very worn. Rather to try to fix the seats I found brand new head and I bought it, but unfortunately it's not my model i guessing. Whether someone know how to recognize for which model GS the head. My old head at the bottom has a mark S-6 and the new one has S-3. Also measuring the valve seats the new one inlet ID is 21mm the old one is 23mm, exhaust seat ID on new head is 25.5mm respectively 28mm on old head. The chambers are different shape as well, my old one has dome type shape. Apart of that the heads looks exactly the same. I hope somebody with experience can tell how to determine for which model is that head. No part number or something on the casting.
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