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Haven't been here long but appear to have an exact answer for everything.

Check out Strouds Marine and they also have them for the 300 Yam

Looks like the mechanic did you a dis-service.

Sorry to hear about that, and your issue is a new one. When you login I seam to remember there is a "stay logged in" box, are you checking it? @tpenfield @Fun Times

My name is there (not actually seeing it other than a graphic) but their are no dates, military designation so it can be anyone with the same name.

Before I would go there I would want (in your case) to actually see like your Dad's name, or another

It's a secret

Done used up all the luck on getting the boat

The only way to find out what is needed is to tear the head down and measure, a machine shop can do this or you if you have the gauges. It way also need valve guides

I'm finding it came with a single motor (8.5 beam) either a 5.0 or 5.7. My guess is it was a dog with a 5.0 and did ok with a 5.7 It had enough beam for a BB but don't see any that had it, and if it did it would run pretty good As for the drive it could come with either. Friend had about the...

B2 drives are best for large heavy twin engine boats that won't fully plane and will not exceed 30 mph WOT. With a 20 inch diameter aluminum prop it moves a lot of water and you don't have to worry much about galvanic corrosion. Backing is a issue with crabbing B3 drives are best for mid range...

Stern Jack for 350HP motor, that's going to be beefy and will set motors further back so may need to come up more, maybe? Maybe check also on a shorter leg, but that will be pricey

Not necessarily yours but many boats use a single Bat to start both motors and can have 1 or 2 other Bats for the house loads. How is yours configured?

What a find, congrats

Agree, looks low

I wonder how this will actually be done. I entered mine, my Dad's and then John Smith and all gave a 6 digit code. Now figuring just how many John Smith's there are over the years, and how one 6 digit number will be able to find the correct one, or are there just one John Smith for all?

Thanks, yours doesn't have a IAC, the PCM controls the idle. Being a optimax need to check your fuel and air pressure. I'm finding fuel pressure should be 90 psi and air pressure should be 80 psi

With a boat your size I would expect something close to 1.0 mpg, mine is half you size and weight a bunch less and my best cruise is around 2.3 mpg

Sounds like IAC what is your serial number ?

Check fuel pressure at the rail. Ive found most marine motors manifold pressures are a tad lower than autos Its list each cylinder but no actual numbers so no misfires