"My port engine was idling rough so I ran a compression test, engine is about 20 hours new so I was suprised to find zero compression in one of the cylinders. I dumped oil in the bad cylinder with no compression change. All of the other cylinders had over 120lbs of compression. What to do now? Would I be better off installing new heads or having a head job done. Or should I just put in a new long block? I'm not sure where to even purchase one in Southern California. The boat is not trailerable."