CP Pistons forged racing piston set for the Buick Grand National 3.8 V6 turbo engine. Premium competition piston set suitable for use with nitrous, turbocharger or supercharger. Top quality racing piston set for serious competition use. 3.820 bore ; 3.400 stroke ; 5.960 rod ; 1.835 compression height ; top ring groove 1/16 ; 2nd ring groove 1/16 ; oil ring groove 3/16 ; dish top displacement -27.2cc ; weight 494 grams. Set includes 6 forged pistons; 6 wrist pins and spiral locks. Highest quality and engineered for durability and maximum power output. Pistons are fully CNC machined and balanced to + / - 1 gram. Double pin oilers; pin fitting and pin lock removal grooves for easy lock removal are also included. Supplied with .940 x 2.750 wrist pins weighing 153 grams. Part number CP ZR231
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