SKU: MAH4255MS-112
MPN: 4255MS-112
The MAHLE PISTONS Piston Ring Set 4.250 Bore in file fit configuration is designed for builders and engine shops engaged in high-precision rebuild work on performance and stock engines. This ring set is crucial for achieving reliable compression sealing and oil control across the critical bore diameter of 4.250 inches.
File fit rings require careful hand-fitting to specific pistons and cylinder walls, allowing experienced technicians to optimize ring gap clearances for their exact application—whether for street, track, or boosted scenarios. MAHLE emphasizes precise material composition and tension control to minimize blow-by while reducing friction losses, ensuring superior performance compared to pre-set rings.
Professional engine builders and serious DIY enthusiasts will benefit from the control that file fit rings provide. This approach is best utilized with access to a ring file, proper measurement tools, and installation experience, as rushing the fitting process can lead to suboptimal performance.
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