Good morning to all, i am new to this forum and wanted to take this opportunity to say hey, and pose my first question. I have a 1984 75 Hp Merc. serial number 6558325. It being a 33 year old motor i have sent off for a lot of maintenance parts i.e carb kits, plug wires,plugs,fuel pump rebuild kit etc. So while i am waiting i bought a Seloc manual to brush up on the timing specs etc. The manual calls for max timing 23 before TDC and just dashes for the primary pick up. On the other hand the airbox cover says 27 BTDC at 5500 rpm with timing pick up of 4 ATDC running. Any clues as to which one is correct ? Thanks in advance.