6.2 L Rebuild Noise

[salty3rd]

Gents, We finally got this rebuilt 6.2 running today, but I’m worried about the knocking sound, can anyone identify what it is? Thanks in advance
View attachment IMG_2869.MOV

 

[Bt Doctur]

rod knock or wrist pin knock ,a loose connecting rod bearing or a missing conrod bearing

 

[itsathepete]

That does sound like a bottom end knock but it's frequency seems too low. Makes me think valve train but it doesn't sound like a lifter or rocker. The hollow sound is reminiscent of a crank throw hitting the oil pan or a con rod like Bt Doctur mentions but, again, frequency seems too low. Any chance the cam sprocket is hitting the timing cover? Or distributor gear is damaged? Please give more info about the rebuild

 

[alldodge]

Sounds like one knock per revolution comes more so from the rear. Flywheel area maybe

 

[achris]

Define '6.2L rebuild'. Was the engine originally a 6.2 (before the rebuild) or was it a 350 that's now been stroked? If it's stroked then who did the block clearances on the rotating assembly?

Chris...

 

[itsathepete]

When I watch the video, I was counting 4 or 5 knocks per second but now I hear another quieter knock after the louder one so yeah one knock per revolution essentially.