Tell me this noise isn't what I'm afraid it is.

[Old Henry]

Originally Posted by Jack E/NJ

So what's the noise like when you disconnect both wires to plugs 1 & 5? Does it sound any different than when you disconnect 2 & 6 or 3 & 7 or 4 & 8? Cpmpression seems kinda low on all cylinders.

Jack E/NJ

Knocking is reduced by pulling the sparkplug wire on either 1 or 5 and totally eliminated by pulling both.

What does it all mean?

[Kube]

Originally Posted by Old Henry

Knocking is reduced by pulling the sparkplug wire on either 1 or 5 and totally eliminated by pulling both.

What does it all mean?

Sounds like the bearing and / or crank journal is poopy in that location as both of those rods are connected to the same journal. If this is the case, the crank and rods will need to be properly reconditioned. For that, you will need to remove the engine.
If this engine was "rebuilt" by the same guy that "rebuilt" it in the past I'd strongly advise you have ALL of the rods and journals checked by a professional.

[V8COOPMAN]

Originally Posted by Kube

If this engine was "rebuilt" by the same guy that "rebuilt" it in the past I'd strongly advise you have ALL of the rods and journals checked by a professional.

It WAS kind'a pretty, though! Doc Roger as I remember. DD