well i had to replace the passengerside head do to my intake valve being cracked in 3 spots and all the exhaust valves being burnt... the cam just went out about two hours before i went to replace the head... the driver side has checked out good so far for compression.... my truck is the 3rd known body for that engine.... and i know that the head that was on it has been gone through at least once due to different valve base castings.... but i figured for a rv2 cam with pushrods and hydro lifters for around 156 wasnt bad.. so i have to hope my motor will last to next wknd....