I have a 1993 MasterCraft ProStar 205 with an Indmar 351 with about 1,100 hours on it and it has been running great. However, last week as I was coming into the course the engine blew out the spark plug in cylinder #2
. As it turns out I have a cracked head and I'm replacing both heads. The weirdness happened when I pulled the heads and discovered that the piston in Cylinder #6
(2nd cylinder on the port bank) is rotated upside down. If you look closely at the 2nd image you can see the word "Up" and an arrow....pointing down! I have owned the boat for more than 19 years and the engine has never been apart so I assume that it was assembled with one piston reversed at the factory. Should I be concerned or just put the new heads on and hope for another 1,100 hours?