i just picked up a set of valve covers for my sbf. the are finned and have nrs on them. one of the guys in the club has a set on his t bucket. it has a sbc in it. he was told the nrs stands for "nationwise rod shop" he does not remeber where they came from, they have been on his car for over 15years. i have never seen another set for a chevy, and i bought one of two sets i saw for a ford. i remember there being a nationwise parts store here in town, but it has been gone for years now. any one have any information on this stuff? it would be great to find something out about them, i have searched a little but not found anything. i plan on putting them on my motor this winter and would like to know a little about them when someone asks what the nrs stands for.