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Need a t fitting and a fuel pressure gauge generally can rig something out of 3/8 flare fittings with a little creativity What do the spark plugs look like

If fuel pressure is ok then likely needs carb cleaning and rebuild

Valves are staying open in cylinders 2&3 explosion is backfire or exhaust valve is open when the cylinder fires. Likely the water in the engine means the parts of the engine are rusted like valves Tear the engine down or at least take the head off and see what you have but if you had water in...

Should be willing to do a compression and or leak down test on it. If compression is ok and it has 10 psi /. 1000 rpm of oil pressure hot you ar good to go. would look at condtion of exhaust manifolds especially if in salt water, as Bondo stated lack of maintenance is biggest killer…

Take the 350 out of the suburban put marine head gaskets in and brass core plugs. Might need to swap the cam might not. Typically truck cams and marine cams are interchangeable in terms of use. Marine needs idle to 5k power range… basically strip it to thr long block and swap your marine...

Entirely possible the water cross over inintake cracked. I believe there is a drain plug in it that can get missed

In addition since it takes run time for problem to crop up maybe fuel tank vent is clogged putting tank under vacuum try opening the gas cap when it happens see if it makes a difference

Looks great especially the interior

Did u center the gimbal bearing by inserting alignment tool and smacking it up, down left and right? Would be concern that you may have a bad transom

If I continue to have issues have heard short life of SEI impellers might be worth swapping impeller for oem merc impeller which will hold up very well

Stock marine 5.0 and 5.7 are 9.4:1 so dont see an issue with 87 and 9.4 CR

seriously? guy asked if non trailer tires work, i expressed my experience they do in multiple examples where someone uses their head and doesnt go crazy with miles and speed , And everybody’s grandma comes out of the wood work.

I can and everyone here will tell me not to do it. Very predictable

No put the new sensor in and move on

When have I done the smartest thing ? I guess I shouldn’t tell you about the blizzaks I had on a 22 ft sailboat trailer … off a car I no longer owned but same rim size …

Yeah makes no sense to me but u have to destroy the rotor to get it off . I changed my cap and rotor last season after six years -there was a little green corrosion on the brass contacts in the cap. what should’ve been a 10 minute job took a half an hour and required chisel …stupid

Read attached page from manual 31 specs loctite 271 threadlocker on dist shaft and key

Just did mine last weekend if you don't have the tool you it will be more of a PITA. Mine is a GEN 2- had a note in manual about putting the tool in the end of the bellow to just slip it over the bellhousing , then reposition the tool deeper in bellows (3rd bellows serration) to pull it up and...

No cap came right off. Not sure whey they do it but rotor is nailed on. I didn't use loctite on the new rotor.

By the same he means are you running the same prop on the new engine vs the old engine? Have you always been at 6000 ft altitude? Did you rejet the carb for that altitude? Compression is good place to start, and what do the plugs look like when you pull them And did you get a marine reman...