Perfect Circle 40564CP-030 Moly Piston Ring Set Bore - 4.030 8-Cylinder

The Perfect Circle 40564CP-030 is a premium moly piston ring set designed for 8-cylinder engines with a 4.030 inch bore diameter (.030 inch oversize). Manufactured by MAHLE, the world's largest piston ring manufacturer, this precision-ground performance ring set delivers OE-quality materials and reliable performance for engine rebuilds and overhauls.

Key Features:

• 4.030 inch (102.362mm) bore diameter - .030 inch oversize application
• Ring thickness: 5/64 inch, 5/64 inch, 3/16 inch configuration
• Chrome-faced cast iron top compression ring for extended durability
• Taper face reverse twist design second ring for superior oil control
• 3-piece oil ring with stainless steel expander and chrome-faced steel rails
• Moly coating on compression rings for severe operating conditions
• Complete 8-cylinder set (8 sets of rings included)
• Pre-fit design - no filing required for most applications

Performance Benefits:

• High-strength SAE 9254 alloy steel base material provides superior tensile strength and fatigue resistance
• Special ring face contours and torsional designs ensure optimum compression sealing
• Foolproof installation design prevents incorrect installation
• High degree of conformability within cylinder bore for excellent sealing
• Manufactured under strict quality controls for consistent reliability

Perfect Circle piston rings by MAHLE combine decades of OE engineering expertise with premium materials to deliver professional-grade performance for automotive engine rebuilds. Compatible with various Ford, Chevrolet, and Chrysler V8 applications requiring a 4.030 inch bore.