rod knock or coupler

[thebean69]

i installed a new motor gm 5.7 after about the 5th hour i heard a knocking sound it sounds like a rod knock. I took it into the marina and had the mechanic look at it, he said its either a rod knock or the coupler. I know that the motor has to come out no matter what but befor i call my engine dude is there a quick way to tell if its the coupler

[Tech Support]

I don't believe I have ever heard a coupler sound like a rod knock. You shoud be able to determine if it is a rod knock by pulling the spark plug wires off each cylinder one at a time and seeing if the knock goes away.

Tech Support

[thebean69]

thanks ill try that