Edelbrock Two-Piece Aluminium Timing Cover (ED4254)2 PIECE TIMING COVER CHEV LS1 GM Chev LS series, With Rear Mounted Cam Sensor (LS1 and early model trucks) Part Number: ED4254 These two piece aluminium front covers allow quick camshaft removal and installation without the need to remove the damper pulley or steering components. The cam can be installed and removed through a window in the front of the cover which is sealed with a plate and o ring for superior leak prevention.