JE Pistons J182024 Chev SB 23¡ Dome Forged Pistons 4.125" Bore 4" Stroke 6.1Cc

JE Pistons 350/400 small block dome top pistons are high-compression pistons that are compatible with most aftermarket 23 degree heads and are ideal for drag race and Circle Track applications. Valve reliefs will accommodate oversized valves and long-duration, tight lobe separation cams. Precision CNC ring grooves are designed for 1/16, 1/16, 3/16 rings. However, these will not fit JE Pistons Pro Topline or Brodix cylinder heads. Factory GM heads are used to define standard valve spacing and angle (thus 23°) for many small block Chevy. Additionally most 23° aftermarket cylinder heads incorporate what is commonly known as "60/40 Shift" in order to allow for larger valves. All JE flat top and inverted dome shelf piston set designs accommodate "60/40 Shift" and will work with most aftermarket 23° cylinder heads, including those with oversized valves and angle milled surfaces. TFS "Twisted Wedge", AFR227 and Brodix 10X cylinder heads will require custom pistons.
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 manufacturerto 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.

Application: Chevy small block Gen I 6.6L/400 CID

• Bore (in):4.125 in.
• Bore (mm):104.775mm
• Piston Style:Dome, with two valve reliefs
• Piston Material:Forged aluminum
• Compression Distance (in):1.000 in.
• Compression Ratio with 58cc chamber volume: 14.6
• Compression Ratio with 64cc chamber volume: 13.4
• Compression Ratio with 76cc chamber volume: 11.6
• Dome Volume: 6.1cc
• Gram Weigh 476
• Piston Head Volume (cc):-3.00cc
• Wrist Pin Style:Press-fit or floating
• Pin Diameter (in):0.927 in.
• Piston Ring Thickness:1/16 in. x 1/16 in. x 3/16 in.
• Quantity:Sold as a set of 8.
• Notes:Oil rail support included. Solid dome design.