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Mahle's Pro Series moly ring set for a 4.000-inch bore is a low-tension piston ring package intended for performance use. The set combines moly-faced rings with reduced tension to decrease friction while maintaining a reliable seal in high-demand engines. It is supplied as a complete ring set sized specifically for a 4.000 bore diameter and aimed at performance-oriented rebuilds.
Mahle Rings Pro Series Performance Rings Low Tension 4.000 Bore Moly Ring Set
