im not quite sure what you mean. If you are comparing the Sissel head to aluminum aftermarket small block heads them you are wrong. a good set of aluminum heads go for about 1600-2000 depending on whether you get them assembled or not where as the last i checked the Sissle head is well over 3500, not to mention the intake and exhaust that must be fabricated to match.. i agree that the sissel head is a great accomplishment and takes a lot of talent to produce, i was just wondering why or if the Sissle head will ever be mass produced in order to allow everyone to enjoy it, not just those with a lot of money, much like the v8 community and their aftermarket heads.