Features: Our gaskets and seals are designed to meet or exceed all Original Equipment (OE) specifications for proper sealing Advanced manufacturing technology ensures durability and optimum operation Specialized designs yield significant and noticeable improvements to your car engine Engineered and manufactured specifically for aftermarket repairs or 'do it yourself' projects Application-specific design ensures correct fitment Fits for 2002-2004 Chevrolet GMC Buick Cadillac 5.3L 4.8L OHV MLS Head Gasket Set Bolts. This head gasket set and head bolts is just what you need to keep your car in good running order. The head gasket set and head bolts that you will receive in this kit is a high quality gasket that the dealers and rebuilding shops use everyday. So do not settle for lesser quality parts when it comes to engine repair. These head gasket set and head boltss are designed for the professional installer. It does not come with any installation instructions. If you do not have a service manual, please consult a professional mechanic prior to installing this head gasket set and head bolts. Remark: This kit include the valley pan gaskets for engines with Active Fuel Management (AFM.) system, and without Active Fuel Management (AFM). However the plastic AFM valley pan gasket in this set only use to replace the perimeter seal only. This kit DOES NOT INCLUDE the complete valley pan gasket that use to service Displacement-On-Demand solenoids. For 2004 engines there are two different designs for the head bolts. 1st design head bolts have 16 Long Bolts: 150mm, 4 Short Bolts: 100mm, 10 Small Bolts: 45mm. 2nd design head bolts have 20 Long Bolts: 100mm, 10 Small Bolts: 45mm. This kit ONLY FITS engine with 1ST DESIGN HEAD BOLTS (16 long bolts: 145mm, 4 short bolts : 100mm, 10 small bolts: 46mm). Please double check your engine head bolts to make sure this kit will fit your engine before making the purchase. Fits 02-04 Chevrolet GMC Buick Cadillac 5.3L 4.8L OHV MLS