The Stovebolt Site Forums The Shop Area Driveline Engine noise

Many Thanks Pre`68 Dave and Tiny Jaime!
GREAT input.
A couple of thoughts:
1. There is no noise at idle. It comes on at 1800 RPM. Don't know if I can drive the truck on 5 cylinders without hurting something. Guess I'd have to keep pulling plug wires until I find the noisy rod bearing. Is this practicle?
2. Have also given thought to rebuilding it myself. Before I pull the engine I may be able to drop the pan with the egine in the vehicle. This way I could check the rod bearings and measure the rod journals. Is this a good idea? Replaced the rear main seal by dropping the pan with the engine in. Should be able to check the rod journals the same way.
Appreciate Any and all suggestions.
Thanks