I pulled this engine because I was replacing the floor in my boat. The engine ran great, had an 8 psi split between the highest and lowest cylinders in a compression test, and all cylinders passed the leakdown test. Since I pulled the engine, I decided to give it a quick look to see if it needed any attention.
After cleaning a lot of carbon off the pistons, I found two pistons that had some damage. Are these pistons useable? If not, can I just replace the two pistons or do I have replace them all?