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The JE Pistons 391731 piston kit is engineered for high-performance engines requiring durability and precision. Featuring proprietary aligned grain flow forging technology, these pistons deliver maximum tensile strength, ensuring reliable operation under demanding conditions. The ceramic crown coating provides excellent heat resistance, reducing heat transfer and protecting the piston during high-RPM and high-boost scenarios. Internal and external bracing enhance the strength-to-weight ratio, promoting longevity and consistent performance over time. 3D undercrown milling in non-critical areas minimizes weight without compromising structural integrity, contributing to improved acceleration and responsiveness. Lateral gas ports and an accumulator groove maintain optimal ring seal at high RPM, ensuring consistent power delivery and compression.
The Tuff Skirt coating, a proprietary moly-based dry film applied in-house, significantly reduces operating friction, which enhances wear resistance and reduces piston slap noise. An offset pin design minimizes piston rock, further reducing engine noise and improving overall engine smoothness. Skirt notches at the bottom dead center provide optimal clearance, preventing piston contact during operation. This kit includes two pistons, a premium ring pack, wrist pins, and wire locks, offering a comprehensive solution for high-performance engine builds. Built for engines with a 4.250-inch bore and a compression ratio of 11.25:1, these pistons are suitable for a wide range of applications, from street performance to racing.
Designed with precision and durability in mind, the JE Pistons 391731 kit ensures your engine can withstand the rigors of high-performance driving while maintaining excellent reliability. Whether you're rebuilding or upgrading your engine, this kit provides the essential components needed for a robust and efficient setup, backed by JE Pistons' reputation for quality and innovation.
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