Stuck intake valve

[boatsnbars]

Update: The boat went back in to the water on June 6. I had to replace the oil pan because it was leaking. I also replaced the exhaust manifolds with OEM's. Everything seems to be working well now. I will be replacing the gasket between the riser and manifold every year as maintenance as it seems to be a weak link. I am going to pull the risers off the starboard engine and inspect it, then replace the gaskets. Hopefully this prevents future problems.