I just bought a 1978 23ft Seacraft Seavette. It has the Mercruiser 420HP 454. I need to do a tune up on it and I would like to know the entire tune up specs. Such as timing, spark plug type, plug gap, idle RPM, etc. Some one has apparently replaced the carb. It looks like a Holley 850 double pumper with an electric choke. The carb # is 9022. I understand that the original carb was an 800 CFM. What was the jetting and power valve size on the 800 carb? Would anyone happen to know the gear ratio of the TRS outdrive, and how much would the engine and outdrive weigh?
Thanks! Steve Burnsed