Wiseco 4007GFX GFX-Style Piston Ring Set 4.007 in. Bore 1.2/1.2/3.0mm File-Fit

The Wiseco 4007GFX is a GFX-style performance piston ring set designed for a 4.007-inch (101.778mm) bore. Sold individually to fit one cylinder, this ring set is engineered for high-performance automotive applications including late-model EFI engines and small block builds that require precision ring sealing and reduced friction.

Ring Set Composition:

• Top Ring: 1.2mm steel gas-nitrided, chrome-plated, barrel-faced for superior wear resistance and sealing
• Second Ring (Napier-Style): 1.2mm taper-faced ductile iron for effective oil scraping and compression support
• Oil Control Ring: 3.0mm three-piece assembly with stainless steel spacer and chrome-plated rails

Key Features:

• File-to-fit design allows precise end gap customization for your specific application
• Gas-nitrided steel top ring provides enhanced surface hardness and long service life
• Napier-style second ring improves oil control while supporting compression
• 3-piece oil ring assembly with stainless steel expander and chrome rails for consistent tension
• Matched to Wiseco's GFX ring groove specifications used across their late-model EFI and performance piston lineup
• Sold per cylinder — order the quantity needed for your engine build

Wiseco's GFX ring sets are the preferred choice for performance engine builders pairing these rings with Wiseco's late-model EFI and high-performance piston lines. The 1.2/1.2/3.0mm ring pack configuration offers a modern, low-tension profile that supports maximum power output while maintaining reliable sealing across a wide range of operating conditions.

Note: This ring set fits one (1) piston/cylinder. Order one set per cylinder for a complete engine build.