Copper Clad Connecting Rods

Have a 400 at the shop now that is also factory 020 over. It has 4 copper rods. Just a FYI, the factory 020 "440" is not 020 over, it is actually .022 over, which would be a bore of 4.342. Bore size look familiar? Yup, a standard 400 size. Anyway a few copper filled rods for comparison.
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