13° All Pro / 13.5° GB2000 Forged Dome Piston Small Block Chevy 407, 4.130" bore, 5.850" rod length, -4.5cc dome volume

Ideal for Sprint Cars or Dirt Late Models, the deeper valve reliefs (.320" int, .260" exh) now accommodate bigger cams and smaller chambers. Precision CNC-machined ring grooves now accept 1.2, 1.5, 3.0mm rings for reduced friction, while Lateral Gas Ports have been added for improved ring seal. Pin upgrade to 927-2750-17-93S recommended for applications over 700HP. This new configuration outperforms the competition hands down!

Includes:

• Pin #927-2750-15-51S(130g)
• Double spiro locks #927-042-CS
• Lateral gas ports with accumulator grooves
• Double pin oilers

Specifications:

• Part #: J281798
• CID: 407
• Bore: 4.130
• Stroke: 3.800
• Rod Length: 5.850
• Block Height: 9.000
• Compression Height: 1.250
• Compression Ratio with 40cc chamber volume: 16.5
• Compression Ratio with 45cc chamber volume: 15.2
• Compression Ratio with 50cc chamber volume: 14.0
• Dome Volume: -4.5cc
• Gram Weight: 475
• Footnote: Solid dome design
• Oversize: .005
• Recommended Ring Set (Check Proseal listing to determine oil ring tension): J75008-4130-5

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.