BRAND NEW Set of 8 BMI Pistons Compatible with MAHLE +.040" Rings Included and installed. (21:1 PISTONS) MAHLE is OEM (Original Equipment Manufacturer) for GM Why waste money on some Asian knock-off brand piston when you can have real MAHLE OEM Quality, with coated tops for near the same price?? FCompatible with: All GM 6.5L V8 Turbo and non-Turbo DIESEL Engines 1992-2002 VIN: F, S, Y, P and 3 (8th character of VIN#) These Pistons fit Applications including all: 1992-2002 Pickup Trucks, Vans and H-1 Hummer Applications THESE PISTONS HAVE A FACTORY APPLIED HARD ANODIZED CROWN (TOP) TO ADD DURABILITY AND PREVENT CARBON BUILD-UP. All Automotive 6.5 applications use 21:1 compression ratio.... both turbo and non-turbo... use the same pistons and compression ratio from GM factory MAHLE Pistons: 1. Ni-resist top grooves to control groove wear. 2. Balanced Set of 8 for smooth engine operation. 3. Eutectic aluminum Piston material is chosen because it bonds better with the ring land or ring groove inserts used to strengthen and better support the piston. MAHLE Piston Pins: 1. High strength steel 2. Case hardened MAHLE Piston Rings: 1. All three rings that MAHLE/CLEVITE uses on their aftermarket loaded pistons are truly unique and are without a doubt, these ring-sets the absolute best in the business. The top rings are high strength steel with high velocity Moly impregnation. They are an ideal mix of metals because the steel provides superior durability while the Moly facing provides a hard surface that allows superior compression sealing. 2. The second ring (middle of piston) is your second line of defense for sealing compression from the above & oil from below the piston. The high strength steel composition of this ring is ideally suited for both of these critical purposes. 3. The oil ring (bottom ring) is completely unique to MAHLE CLEVITE. These rings have been improved further by adding a nitrite coating & a chrome finish.