When the engine is in park there isn't as much of a load on it so it will not be as noticeable.
That would be a destroked motor, and would result in a 285.
A guess would be 5-600lbs
motor mounts?
The 5.3L engine would equal aprox 327 cubic inches.
I would not worry to much about this noise when the motor is cold; engines have clearanaces that come together at operating temperature. If this noise happens when the motor is at operating temperature then you might have a problem.
Check connections at the blower motor, blower motor resistor and at the switch. You may find a melted connection.
A 5.0L would equal a 305 cu.in.
if you dont have any oil in the cars motor that would be a reasin why its knocking
Probably some kind of back-up in the radiator and then when you started it back up it might have loosened it up and got rid of it.
NO IT WILL NOT. Must use V-8 frame mounts and motor mounts.
If they are both 3100 engines...yes. Direct swap. The only thing you MAY have to change would be the motor mounts.
That would be the 4L60E