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Agreed trim it back down a hair and the rattling should stop

Our dock is in shallow water (27") so every time I go in or out we are at max up on the trailer button. Important to keep rpms at a min doing this Would pull your drive check gimbal bearing, U joints, and engine alignment. Check bellows for cracking or splits. Also a good time to do the water...

Take the elbow off and see if the passages are clear. I think you may also be able to take a cap off each end of yours. As along as water can flow it is ok

In freshwater they outlast the boat. Have had boats 40+ years old with original exhaust manfiolds in perfect working condition

I would bet the passages in your thermostat housing are plugged. The one "after the thermostat" -I assume you mean the hose that feeds water to manifold? that should be flowing some water at all times to cool the exhaust even when the thermostat is not open. Or do you have a separate feed to...

What is the drive ratio? I think with a boat that light will need a 1.47 drive and probably a 21" pitch or maybe a tad more pitch. As outlined you want to find a prop shop like Hills or I think Prop MD does pitch exchange. Just need to find someone who will work with you to try before you buy...

I think the 4 th one is for trailer button you have two up buttons trim and trailer trim works through the limit switch trailer always works regardless of drive position

When reading plugs they show what you last ran which was likely idle to read them you need to run at what ever rpm you want to look at afr then cut it off immediately and pull a plug

You will not get any power to fuel pump if engine is not running and ignition is on unless you jump out the oil pressure switch. The purple yellow from starter is what supplies power during cranking. If you think is fuel related dump some gas down carb and crank it over.if you have ignition it...

If you got full amount of water out of the 5 drain plugs then you are good I would drain the -50 af you put in and leave it dry given the temps u state If you ask two guys on here about af or no af you will get 3 different answers … I personally don’t use it and have never had any corrosion...

Would Anni correct pitch show lower or higher vacuum

None of this is really concerning assuming u are running a 160 thermostat if you are running a 140 and these are accurate temps the something is amiss 5 degrees coming off plane is not an issue If you don’t know when last replaced do the impellers and use OEM merc parts the gen 2 impeller...

Pontiac used to offer a vacuum gauge in the 60s it is hooked to manifold vacuum with a small tube. Generally it is used for economy indication as vac drops with throttle opening. Not sure what place it has on a boat as part throttle cruise doesn’t exist in a marine application like on a car at...

If u need to refog it just unscrew add more oil and use it next year will not hurt the filter

Has your friend checked with his insurance ? Might be covered it was for my friends bravo 3

On the bottom right of the graph it reports max hp as 244 which matches the graph. You have to download and blow up the pic to seeit. If you pd for 360 tell them to show u where on the dyno graph it is. The power falls way off at higher rpm likely due to the carb used it ran out of air. It said...

According to this it made 244 hp, and torque dropped way off at higher rpm. Stock merc 383 is 340 hp so comparatively something is really wrong. Roy means his sister had a 24 ft Sea Ray in the 80's for 10 years.... You can google the tuner companies give them your cam grind and they can set...

Why do you have to trash the filter? Let the fuel clean it out and run through it in the spring

Is this the same 555 ECM ? https://www.cpperformance.com/p-81018-ecmpcm-555-custom-calibration.aspx I think these guys list offer a 555 to MEFI conversion

Not always. Im sure some higher end motors are 4 bolt but plain jane 3.0/4.3/5.0 are not 4 bolt.