GM Lumina Chevy Malibu 3.1 3.4 Cast# 487#170 Pontiac Aztek Cylinder Heads 8MM (CORE RETURN REQUIRED)

Complete disassemblyand thorough cleaning via hot tank & pressure tested to confirm castingintegrity Valve job Performedwith all required angles & vacuum tested to ensure perfect compression. CBN milled to ensurea super smooth finish. (CBN stands for Cubic Boron Nitride, and is best forcast iron heads). PCD milled to ensurea super smooth finish. (PCD stands for Polycrystalline Diamond, and is bestfor aluminum heads). New valve stem sealsinstalled on all our heads & all valve guides are replaced with new onesas necessary. New valve seatsinstalled as necessary NO UP-FRONT CORE CHARGECORE RETURN REQUIRED WITHIN 21 DAYS OF DELIVERYPREPAID RETURN LABEL(S) PROVIDED**CORES MUST MATCH THE HEADS PURCHASED****NO CAM SEALS HAVE BEEN INSTALLED ON ANY OF OUR HEADS**