CHEV 489 4.280" BORE 1.270" COMP DISTANCE SRP142979. SRP big block Chevy flat top/inverted dome pistons are made from 4032 low-expansion, high-silicon aluminum alloy that is heat-treated to SRP specifications. Their ring land and crown thickness are specifically engineered for mild turbo, supercharged, and nitrous applications. They include a pin fitting, double Spiro locks, and a wall wrist pin. Their CNC-machined ring grooves accept 1/16, 1/16, 3/16 rings, which are sold separately. Pin upgrades are available. Application: Chev Big Block 454 Mark IV, Gen V, VI to 489 C.I.D. Bore (in) 4.280 in. Bore (mm) 108.712mm. Piston Style Flat top, with single valve relief. Piston Material Forged aluminum. Compression Distance (in) 1.270 in. Piston Head Volume (cc) +3.00cc. Wrist Pin Style Press-fit or floating. Pin Diameter (in) 0.990 in. Piston Ring Thickness 1/16 in. x 1/16 in. x 3/16 in. Quantity Sold as a set of 8. Notes Gram weight 520g. Oil rail support included.
