Works with all factory installed components, no machining of balancer, no spacing your fan hub out, no trimming your vacuum pump shaft. Install it right out of the box! Pump access cover uses a heavy duty o-ring to ensure no leaks and no mess. Cover is setup to mount a Waterman gear driven fuel pump if you wish to run one, otherwise use the cover plate that is included. Now features flat head stainless hardware to mount the front cover. Price includes shipping and all hardware for installation.