This piston set is specifically designed for Naturally Aspirated 632 engines to fit the following cylinder heads: 12° Raptor, 12° Pro-Filer, Dart Big Chief 14° (program #'s 3815 & 384), Sonny Tru-Pro 14.5°, and Brodix PB1200. Precision CNC machined ring grooves are designed for .043 back-cut top rings, .043 D-wall 2nd rings, and 3.0mm oil rings. Compression distance and compression ratio calculated with zero deck clearance at listed block height.

Includes :

• Double forced pin oilers
• Pin #990-2930-18-51S(174g)
• Double spiro locks #990-042-CS
• Rail supports #4600-203
• Accumulator Grooves
• Vertical gas ports for maximum top ring seal

Specifications:

• Part #: J280263
• CID: 632
• Bore: 4.600
• Stroke: 4.750
• Rod Length: 6.700
• Block Height: 10.195
• Compression Height: 1.120
• Compression Ratio with 65cc chamber volume: 16.4
• Compression Ratio with 70cc chamber volume: 15.5
• Compression Ratio with 77cc chamber volume: 14.5
• Dome Volume: -7.3cc
• Gram Weight: 575
• Footnote: Oil Rail Support is Included
• Oversize: STD
• Recommended Ring Set (Check Proseal listing to determine oil ring tension): J77008-4600-5

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.

Product Reviews for J280263 - JE