Big Block Open Chamber Dome - Standard/Tall Deck Block Forged Piston 258220 J258220 Big Block Chevy 565, 4.600" bore, 6.535" rod length, 40.0cc dome volume BBC 4.600" PISTONS +40cc DOME These big block pistons are an excellent choice for drag race applications. These pistons will not work with Edelbrock heads ED6045, ED6040, ED6055, pistons for these heads are available as special order. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings.

Includes

:

Double pin oilers

Pin #990-2930-15-51S(150g)

Double spiro locks #990-042-CS

Accumulator Grooves

Standard Deck Block Specifications

:

Part #: J258220

CID: 565

Bore: 4.600

Stroke: 4.250

Rod Length: 6.535

Block Height: 9.780

Compression Height: 1.120

Compression Ratio with 110cc chamber volume: 15.3

Compression Ratio with 118cc chamber volume: 14.0

Compression Ratio with 124cc chamber volume: 13.2

Dome Volume: 40.0cc

Gram Weight: 599

Footnote: Oil Rail Support is Included

Oversize: .134

Recommended Ring Set (Check Proseal listing to determine oil ring tension): J100U8-4600-5

Tall Deck Block Specifications

:

Part #: J258220

CID: 632

Bore: 4.600

Stroke: 4.750

Rod Length: 6.700

Block Height: 10.195

Compression Height: 1.120

Compression Ratio with 110cc chamber volume: 17.1

Compression Ratio with 118cc chamber volume: 15.6

Compression Ratio with 124cc chamber volume: 14.7

Dome Volume: 40.0cc

Gram Weight: 599

Footnote: Oil Rail Support is Included

Oversize: .134

Recommended Ring Set (Check Proseal listing to determine oil ring tension): J100U8-4600-5

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.