I AM LOOKING FOR A MACHINE SHOP THAT HAS DEALT A LOT WITH SR20 HEADS. MY HEAD MAKE A LOT OF NOISE (SHIMS, KEEPERS, GUIDES?) INTAKE CAM IS WORE OUT ON ONE OF THE LOBES. DO NOT KNOW WHAT IS GOING ON. NEED SOMEONE TO PUT MY CAMS, VALVESPRING, RETAINERS, AND SHIMS IN ALL THE RIGHT PLACES ON ANOTHER HEAD THAT I HAVE.