JE 400 Small Block Chevy - 13° All Pro / 13.5° GB2000 Flat Top Forged Piston (J281800)

J281800 - SBC 4.140" PISTONS -4.5cc FLAT

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

Part Number: J281800

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-CS
Pin #927-2750-15-51S (130g)

Features:
Double Pin Oilers
Lateral Gas Ports
Accumulator Grooves
Piston Specifiaction:

Make: CHEVROLET
Engine:SMALL BLOCK CHEVROLET
Bore Diameter: 4.140
Compression Height: 1.250

Compression Ratio with 40cc chamber volume: 16.5

Compression Ratio with 45cc chamber volume: 15.2

Compression Ratio with 50cc chamber volume: 14.1

Piston Volume: -4.7

Cylinder Head: CHEVROLET 13 DEG
PistonPin Outside Diameter: 0.927

Piston Pin Length: 2.750
Piston Pin Material: 5115
Ringset Included: No
Top Compression Ring Thickness: 0.0475
Second Compression Ring Thickness: 0.06
Oil Ring Thickness: 0.119
Piston Material: 2618
Forging Type: Round
Piston Avg Weight: 476

Pin Wall Thickness: 0.150
Piston Type: Dome