Take an old pc of rope, or a spark plug wire ,stuff it in the cylinder put a wrench on the front of the engine and turn engine over till it compresses the rope against the bottom of the valve, this will hold the valve up,the chevy style valve spring compressor will work just fine remove the rocker assembly and reinstall one of the 5/16 bolts the chevy tool will hook under the bolt so you can remove the spring,pretty easy job. Dick