Why is one 340 connecting rod bronze color?

68gtxman said
The machine shop said that it was not damaged. Just a casting defect that should have been rejected. Both end holes were parallel still. No hammer marks on it.

I will not be running it again!

I've got some that look a bit 'bent' looking but are not, and I checked the parallelness and it was good, so sometimes the castings are just funky.