I'll give you the reciept from Jerry for his work..he rebuilt...reskinned..and restored these heads...I'm not sure the dates...but I will dig them out shortly and let you know...you are welcome to call Jerry also of course...but let me dig them out and I'll send a PM...I just got home from out of town, so it wont be until a few hours...but I'll contact you and let you know exactly what I have... Jerry also totally rebuilt my motor..it should be going on the dyno next month..finally...