Paul is right they are the 333882 casting heads they can be tough to find these days as they were the required heads for lots of stock car dirt track classes so most of them have been gobbled up and/or reworked by hot rodders. I specifically looked for ones that had never been touched ie 1.94 intake and 1.50 exhaust valves. I found a set last summer in a boat bone yard that I had cleaned and tested and was able to bolt on untouched. Only cost me $100 for the heads and $40 for cleaning and testing got off cheap that time. This set may require a little more work. I have read some good articles about these heads. The only bad part is when they are raw water cooled the water passages tend to deteoriate.
