JE Big Block Flat Top Forged Piston - Standard/Tall Deck Block (J257971)

J257971 - BBC 4.500" PISTONS -3cc FLAT

Big Block Chevy 509, 4.500" bore, 6.385" rod length, -3.0cc dome volume

Part Number: J257971

These big block pistons are compatible with forced induction, nitrous (Except 1.120 compression height) and angle milled heads. Valve reliefs will accommodate oversized valves and long duration, tight lobe separation cams. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Will fit both open and closed chamber cylinder heads.
Includes
:

Pin #990-2930-15-51S(150g) - 1.120" Compression height

Pin #990-2930-18-51S(174g) - 1.245" Compression height and above
Double spiro locks #990-042-CS

Standard Deck Block Specifications
:

Part #: J257971
CID: 509
Bore: 4.500
Stroke: 4.000
Rod Length: 6.385
Block Height: 9.780
Compression Height: 1.395
Compression Ratio with 110cc chamber volume: 9.5
ompression Ratio with 118cc chamber volume: 9.0
Compression Ratio with 124cc chamber volume: 8.6
Dome Volume: -3.0cc
Gram Weight: 637
Oversize: .034
Recommended Ring Set (Check Proseal listing to determine oil ring tension): J100F8-4500-5

Tall Deck Block Specifications
:

Part #: J257971
CID: 572
Bore: 4.500
Stroke: 4.500
Rod Length: 6.535
Block Height: 10.180
Compression Height: 1.395
Compression Ratio with 110cc chamber volume: 10.4
Compression Ratio with 118cc chamber volume: 9.9
Compression Ratio with 124cc chamber volume: 9.5
Dome Volume: -3.0cc
Gram Weight: 637
Oversize: .034
Recommended Ring Set (Check Proseal listing to determine oil ring tension): J100F8-4500-5
With over 60 years of experience, JE Pistons is the leader in high performance forged pistons. We've built a reputation that the competition can only follow. JE has a history of manufacturing the highest quality pistons and components that professional engine builders, race teams, and high performance enthusiasts trust and rely on.
The top engine builders in NASCAR, ALMS, NHRA, AMA Supercross and others choose JE Pistons over any other brand. For over 60 years, JE's position at the forefront of performance piston manufacturing has been a result of continuous research and development of unique materials, piston designs and technologies. Utilising State-Of-The-Art CNC machines for manufacturing along with purpose-designed forgings, JE is able to maintain exacting specifications on each and every piston and hold tolerances to millionths of an inch. Also available from JE is industry-leading processes like Ultra Crown, a Digital Three Dimensional piston crown machining process and Finite Element Analysis (FEA). FEA is a computer process whereby stress and fatigue are tested on a computer model before it goes into production. JE is the only performance piston manufacturer to earn the QS-9000 quality standard which confirms that JE provides customers the highest standards in quality control. In addition, we also have State-Of-The-Art inspection equipment and testing equipment which enables us to constantly bring you, the customer, the very latest in piston design configurations.