Merc 7.4L V-8. MPI. Bravo. I forget the engine number but it started as OL3...... i forget the rest. Boat sat for about 1 year, then was used once, then sat for another year. Did a compression test to see how everything was mechanically and here are the numbers 1=145, 3=150, 5=125, 7=150, 2=150, 4=150, 6=125, 8=160. 5 and 6 struggled to reach 125 while the rest were at about 150. 5 and 6 are directly across from eachother so i was wondering if this could have anything to do with a valve being hung due to the boat not being used that much. Could a valve on one side even effect the other side's compression?
