340 connecting rod oil squirters

We had a noises like that from a fresh rebuild soon after starting it. Here is what we found to be the culprit. The engine was balanced and the heavy metal welded into the side of the counter weight the weld was hitting the rear of the blocks main cap saddle. Drop the pan you will see what I mean. Clearance the block, Do not remove metal from the crank. Many times a motor with not enough stall for idle with a larger cam. pushes the crank forward in gear from pressure . This will cause premature thrust bearing wear. Put a dial indicator on the damper. move it front to back and check the measurement of movement. If it is not to spec it will make noises if a protrusion of weight welded in contacts the block somewhere. I cannot tell you how many times we have seen this. Find another builder ?

also When ever you install a larger cam with a idle lope. If it dies more than a couple RPM's in gear it is pushing hard on the crank from hydraulic pressure from the torque converter. when Ever I hear a car with a large cam die down in idle when putting it in gear. I just laugh some of you guys just don't get it. If it don't sound like horses in gallop while in gear. You have stall issues or timing drop off. I heard cars at Carlisle leaving sounding like an old steam engine pulling a hill. They think that sounds cool . It is only doing damage to the thrust bearing.