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I had to buy new valve covers, the ones in the pictures were a crappy casting, and the rocker arms sat there and hit them.
Sorry to hear that dude. Must be disappointing to do all that work on the build only to have it not run like you were hoping. Hopefully it'll shake itself out there. Wow, yours doesn't make power UNTIL 4500? Crazy. What do you shift at? Mine starts to drop off AT 4500 lol I looked up your cam though and it kinda doesn't surprise why you have the super soft bottom end:Crane Energizer Cam & Lifters 3200-6200 RPM #100182 286/286 adv duration .462/.465 lift Valve Springs must be change, 2500+ stall, Not Computer CompatibleThat's a fairly hairy cam you have for a rather heavy truck. What rear gears do you have? Lots of duration there for a somewhat modest valve lift. What's the LSA on it?
Why do you think the valves are too tight? Do you mean you suspect they were tightened to the point of making the lifters solid? Did you install the cam straight up? If so, try advancing it 4°. That is a fairly aggressive cam for the street, so it is definitely possible you over did it.You don't know what gears you have?