Copper PlatingJune 17 2017 at 10:45 AM
Bill Conley (Login EndlessProject)
Response to Factory Rod coating ?
Rod big-ends are checked on the line with a "go - no go" gauge.
Back in the day, many rods found oversize or out of round could be saved by copper plating (to build up the surface) and re-honing the big end. They would be sent out in batches for rework, then make it back onto the assembly line. It's fairly common to see the odd copper-color connecting rod in a light duty passenger car engine.
They didn't seem to be doing that anymore when I was in Ford Engineering in the 90's. I even did a stint as a line foreman in Cleveland, putting together the ancient 300 I-6, and I never saw a copper rod. Maybe they figured out that repaired rods weren't worth the warranty risk on a new engine...