I have a Chevy rebuilt motor with 42 hours on it in my boat. Just picked the boat up over the winter from Hatteras. reconditioned the rest of the boat and put in the water. The boat ran fine the fist couple of times then had a fuel problem coming in one day. come to find out that my secondary float was stuck on my Holley carb and dumping fuel when it shouldn't. I removed the bowl and cleaned out and the float started working properly. i noticed a miss and backfire the last couple of times out then it really got bad. removed all plugs and found #8 and #5 had got really hot and they were slightly loose when removed. the electrode was actually metled. put all new plugs in and miss still there. did a compression check yesterday and found that all over 125 pounds except #8 and #5. they are at zero with no needle movement at all. removed the tester and turned over with finger in hole. no air pressure. do you think i have stuck rings, hole in pistons, or burnt valves. not sure if i should pull the boat back out of slip to remove motor or pull the heads in the slip.
