I have my 4.3L OMC Chev. engine out of my boat. I was told I had poor compression in cylinder 3. I had previously blown a head gasket due to a faulty water pump. When I removed the heads I had to untighten the rocker arm bolts to remove the push rods. If these were not reinstalled correctely, could that have given me a poor compression reading? Like a dummy, I did not due a compression check myself. I removed the heads & the valves look OK. Not open or burnt. The cylinders look OK, and the rings appear in tact. Can any one offer me some insight or suggestions?<br /> Thanks, Bart