ok heres the situation.been working on boat for 2 years restoring it.new timing belt.plugs wires cap rotor so on and so on,took it out last year and it started over heating and the ehuast bellow hose cracked.put new one on and took it out for the first run this year.it ran great but had no power.when the marina did a compression check they had 75 in 3 cylinders and 0 in one.i have great oil pressure so im thinking either a head gasket or valve problem ,any ideas?
