These Nitrous Series pistons utilise vertical and lateral gas ports to optimise top ring seal and reduce friction. Ring grooves are machined to accept JE's J860 "HNS" Hardened Nitrous Series rings with .043 backcut top ring, 1/16 taper face second ring and 3/16 oil ring. Compression height calculated using 9.780", 9.800", or 10.177" deck height with zero deck clearance. Fits most open chamber cylinder heads. Part Number 258199 is designed for a decked block.

Includes :

• Contact reduction grooves
• Pin #990-2930-18-51S(174g)
• Double spiro locks #990-042-CS
• Vertical and Lateral gas ports

Specifications:

• Part #: J258201
• CID: 565
• Bore: 4.600
• Stroke: 4.250
• Rod Length: 6.385
• Block Height: 9.800
• Compression 1.290
• Compression Ratio with 110cc chamber volume: 16.0
• Compression Ratio with 118cc chamber volume: 14.6
• Compression Ratio with 124cc chamber volume: 13.7
• Dome Volume: 44.0cc
• Gram Weight: 710
• Footnote: Oil Rail Support is Included, Piston set also suits 4.375" stroke with 6.700" rod length
• Oversize: .134
• Recommended Ring Set (Check Proseal listing to determine oil ring tension): J860L8-4600-5

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 J258201 - JE