I can't add nothing that hasn't been said on the process of changing the cam, but I'm also throwing in a vote sum-1103. I am running it in a 84 K10 with a 350 and 700R4. I am very happy with it. As for the roller rocker, I'm using the Summit 6905's in the same truck. They are Aluminum and run 200.00 a set. I'm using them in the same engine as the cam.39k miles and no complaints.