I bought a 2000 20i with 750 hours. I knew it was taking on gas in oil due to valve or pison/ring problem. I am having the lower end rebuilt (bored , new pistons,rings, mains)and the mechanic wants to leave the original valves (unless one or more are bad), etc in the upper end. THe boat runs great even on 7 cylinders. There is no sludge and it looks like oil has been changed regularly. Should I have him put new valves and other upper end parts in or just not worry about it?
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350 MPI engine rebuild
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