Picked this from another site,out of respect ,no names posted

[Bt Doctur]

#1 I just pulled a 5.0 w a cracked block(not winterized), rebuilt a nice 5.0 out of a van, but reused heads, intake, etc... Problem is a bad rumbling vibration when you crank it or start it, causes the outdrive to jump around a bit. This is the first inboard I've ever replaced, any insight would be appreciated

#2 Interesting. you would have had to remove the outdrive to replace the motor. most would test run the motor before install a drive, just in case.
Installing the drive and now having a noise could indicate a drive issue.

#1 I unbolted the engine and lifted it out, I didn't pull the outdrive, should I have? It slid back together good.

#2 your engine alignment is off, and your destroying the coupler

 

[jthatcher]

But it looked straight when I put it in. What is a coupler?

 

[mwph]

My experience in this area is limited (much like Mr. #1), but even I cringe at what has and could go wrong for this guy. I wonder if the "nice 5.0 out of a van" was parked down by the river.

 

[mvoellinger]

My experience in this area is limited (much like Mr. #1), but even I cringe at what has and could go wrong for this guy. I wonder if the "nice 5.0 out of a van" was parked down by the river.

Bet he paid in government cheese.