WISECO 4158GFX GF-Style File-Fit Piston Rings for 4.158 in Bore

WISECO 4158GFX GF-style piston rings are designed for performance engine builds requiring dependable sealing and precise fitment. This file-fit ring set is intended for a 4.158-inch cylinder bore and is supplied for one cylinder, making it a suitable choice for custom engine assembly, rebuilding, and applications where ring end gap must be tailored to the engine builder’s specifications.
The ring package uses a 0.047-inch top ring, a 0.047-inch second ring, and a 3.0 mm oil ring. Each ring is manufactured from steel and treated with a gas-nitrided surface for improved durability, wear resistance, and consistent performance under demanding operating conditions. The GF-style design supports efficient combustion sealing while helping manage oil control throughout the piston’s travel.
Standard tension provides a practical balance between sealing performance and reduced friction for a wide range of high-performance and competition-oriented applications. Because these rings are file fit, final end-gap adjustment is required during installation to match the engine combination, intended use, and manufacturer specifications. Proper preparation, measurement, and installation are essential for achieving the expected results.
Feature: Brand: WISECO
Feature: Part Number: 4158GFX
Feature: Ring Style: GF-style
Feature: Bore Size: 4.158 in
Feature: Fitment: File fit
Feature: Ring Configuration: 0.047 in top ring, 0.047 in second ring, and 3.0 mm oil ring
Feature: Material: Steel
Feature: Surface Treatment: Gas nitride
Feature: Tension: Standard
Feature: Application: One-cylinder piston ring set

Features:

• Brand: WISECO

• Part Number: 4158GFX

• GF-style piston ring set for a 4.158 in bore

• File-fit design allows custom ring end-gap adjustment

• Includes 0.047 in top ring, 0.047 in second ring, and 3.0 mm oil ring

• Steel construction with gas-nitrided surface treatment

• Standard-tension configuration

• Designed for one cylinder