The Zeekers are about the same as the Indy 440-1's. I had a set of bare Zeekers that had never been touched(still new).I sold them to a friend of mine about 2-3 years ago and hooked him up with Todd Marsh. Todd done a real nice job fixing them. The casting is the weak point on the Zeekers.Also be sure to plug the 1/4 in. oil hole in the head and drill a .060-.080 hole for the oil passage.If not they will fill the valve covers with oil. The 440-1 rockers,intake and all work on these heads.