All-Pro / Gb2000 Forged Flat-Top Pistons For 400 Sbc – 13° & 13.5° Valve Relief (J28180)

Description

400 Small Block Chevy – 13° All Pro / 13.5° GB2000 Flat Top Forged Piston

409 c.i, 4.140″ Bore, 3.800″ Stroke, 5.850″ rod length, -4.5cc dome volume

J281800

81800

These pistons incorporate the results of extensive collaboration with top engine builders. Precision CNC-machined ring grooves now accept 1.2, 1.5, 3.0mm rings for reduced friction, while Lateral Gas Ports have been added for improved ring seal. This new configuration outperforms the competition hands down! Pin upgrade recommended above 700hp.Includes:Double spiro locks #927-042-CSPin #927-2750-15-51S (130g)Features:Double Pin OilersLateral Gas PortsAccumulator GroovesPiston Specifiaction:Make: CHEVROLETEngine:SMALL BLOCK CHEVROLETBore Diameter: 4.140Compression Height: 1.250Compression Ratio with 40cc chamber volume: 16.5Compression Ratio with 45cc chamber volume: 15.2Compression Ratio with 50cc chamber volume: 14.1Piston Volume: -4.7Cylinder Head: CHEVROLET 13 DEGPistonPin Outside Diameter: 0.927Piston Pin Length: 2.750Piston Pin Material: 5115Ringset Included: NoTop Compression Ring Thickness: 0.0475Second Compression Ring Thickness: 0.06Oil Ring Thickness: 0.119Piston Material: 2618Forging Type: RoundPiston Avg Weight: 476Pin Wall Thickness: 0.150Piston Type: Dome

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