I have had them on my 383 in the roadrunner for 10 years. I paid $800 back then. I got the ones ceramic coated inside and out. Well the coating has not weathered very well at all but then the car sits outside all year long.

Anyway they are well made and worth every cent. I always buy the best i can get as the less hassels the better. They have never leaked and i am still using the same gaskets too!