I have a rare set of W2 prototype heads or W3 heads as they were called also.they were meant to be put on the little red express trucks with the 360 but never made it into production.i contacted Ryan at shady Dell speed shop and he identified them for me and said he's only ever seen a couple of sets .They have never had valves put in them and the rocker pads have not machined .Come with a new in the box set of 1.6 Mopar performance blue roller rockers and Holley strip dominator W2 intake and a set of beefy 3/8s pushrods ,no shafts or shaft stands casting number 3577634.1750$ Have another set of W2s with shafts stands iron rockers need reworking asking 1500$ 810 casting.