This listing is for a stock replacement of (8) Intake & (8) Exhaust valves kit compatible replacements for 1996-2002 Chevrolet GMC 5.7 5.7L 350 Vortec engines. VIN Code "R". Vin refers to the 8th character in vehicle ID number. 

• Kit includes: 
• (8) Intake Valves Details: Head Dia. 1.940" Overall Lgth.: 4.882 Stem Dia.: .3410. 
• (8) Exhaust Valve Details: Head Dia. 1.500" Overall Lgth.: 4.920" Stem Dia.: .3410.