Correct, nothing special about them........Unless you happen to need a set that look correct (without the alt bolt holes tapped). I was restoring a 1960 413 a while back, the engine had water in it and the chambers were rsuted and heavily pitted, took me almost a year to find good replacments! Not high demand parts, nothing HP about them (small valves), and they don't bring big bucks ($50.00-$150.00 on average as cores) but definately unique.