Crane Cams' Quick-Lock Valvetrain Stabilizer is the new approach to the now common use of ''stud girdles''for racing engine applications. Most importantly, the kit slashes the time required to perform valve lash adjustments and/or removal and replacement of the stabilizer unit to a fraction of the time other units require. Requires no cylinder head machining or modifications. Complete kit for both heads includes adjusting nuts. Requires the use of tall valve covers.