You will need a valve spring compressor, I beleive the large "C" type that pushes on the head of the valve on one side and the spring retainer on the opposite side should work but I do not have personnal experience on this head type to know for sure. I looked at Oreillys tool loaner program and they have a tool (67057) that may work - it basically connects to the spring near the head and presses down on the spring retainer. I have used a similar one to the Oreilly one to remove a valve spring on head installed on the engine such that I could not use my "C" clamp type.
