These inverted dome pistons are compatible with turbocharged, nitrous and forced induction systems. The valve reliefs are designed to accommodate oversized valves and long duration, wide lobe separation cams. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings and compression height is figured for a 10.300" deck block. Note: SVO A, C, E and BOSS aluminium heads require custom pistons.

Includes:

• Pin #990-2930-18-51S (174g)
• Double spiro locks #990-042-CS

Specifications :

• Part #: J170879
• CID: 520
• Bore: 4.390
• Stroke: 4.300
• Rod Length: 6.800
• Block Height: 10.300
• Compression Height: 1.350
• Compression Ratio with 74cc chamber volume: 9.7
• Compression Ratio with 80cc chamber volume: 9.3
• Compression Ratio with 94cc chamber volume: 8.5
• Dome Volume: -39.0cc
• Gram Weight: 568
• Footnote: .990 wrist pin, Piston set also suits 4.500" stroke with 6.700" rod length
• Oversize: 0.030
• Recommended Ring Set (Check Proseal listing to determine oil ring tension): J10008-4390-5

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 turing 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.