you certianlly do have an attitude problem,he is 100%correct,i have seen spun rod bearings and loud nocking noise with 30+ lbs of oil pressure.you like to argue when you are wrong but people are starting to see what you are.you are not making any friends with your attitude dude.if you want to argue with me have at it,im your huckleberry.

Dang this guy is taking a beating , think he ruled out lower end noise , even the elusive cracked piston skirt noise that beat me up once . Why is the noise gone with eng on stand ? The exhaust was baffled somehow yes ? Bad u joints or coupler slip fit ?

Just watched that video again damn that's loud at idle seems to subside when goosing it wonder if the noise would still be there with the flywheel mounted biscut coupler removed

when the engine was run out of the boat was it on a run stand or just on the floor,did it still have all the marine stuff on it.need more information to try and help you figure out what is causing the noise.

Check filter first as stated above first. Then maybe it's something in the drive making the noise. If its the fuel pump rod I would not see how that would change from in the boat or out but stranger sh!! Has happened!!

I ran the engine in the boat with the drive removed to see if that was the cause. Sound still there.

Engine was on the floor.

All accessories on including the waterpump.

Well if my engine had 30lb oil pressure I would be concerned. That's not enough to suit me. The loud knocking noise is not from a bearing going bad. The bearing is already gone. That's why I asked about oil pressure. I don't give a hoot about making friends. I'm not looking around to do that. I have been called worse things by better people than YOU!!

Maybe since its down in the engine bay it makes it seam louder than it really is. Maybe u can't hear it real well on the ground???

Bell housing, coupler still on? Sounds too loud but maybe pieces of old flappers in the y pipe?

il bet you have been called worse things on a regular basis.every time you open your mouth you prove your ignorance!glad you are not trying to make friends.