I got a pair off ebay for 400 bucks...the guy (100%positive feedback)said the valves and springs are excellent..ready to go on the motor...just got them to my mechinic and he took them to a machine shop and valves are bent, springs are replaced with stronger springs and caused some problems and it will be about 500 bucks to get ready to bolt on. If I wouldn't known that I would of just bought some good aluminum ones...