I bought a 56 Mercury Montclair that started. It wouldn't go past about 15 or 20 mph so I did a compression test and found cylinder number 4 had 0. I found out that the exhaust valve push rod had fallen out of place. I put it back on and now it gets only about 30 on the tester. At this point should I take of the head and check further?? Any advice would be much appreciated.



Will