Perfect Circle 40141CP-030 Moly Piston Ring Set 4.155 in Bore

The Perfect Circle 40141CP-030 is a premium moly-faced piston ring set designed for Chevrolet 400 small block engines with a .030 inch overbore. This 8-cylinder ring set features a 4.155 inch bore diameter and is manufactured by MAHLE under the Perfect Circle brand name, ensuring OE-quality materials and precision engineering.

Key Specifications:

• Bore Size: 4.155 inches (.030 inch oversize)
• Ring Thickness: 5/64 inch, 5/64 inch, 3/16 inch
• Moly-faced top compression ring for extended durability
• Taper face reverse twist design second ring
• Three-piece oil ring with stainless steel expander
• Chrome-faced steel rails for superior conformability
• Complete set for 8-cylinder engine

Performance Features:

• Premium molybdenum coating on compression rings provides exceptional wear resistance under severe operating conditions
• High-strength materials with special ring face contours ensure optimum compression sealing
• Precision-ground surfaces for consistent performance and reliability
• Designed for correct installation orientation to prevent installation errors
• Three-piece oil ring design provides high degree of conformability within cylinder bore

This ring set is ideal for engine rebuilds, re-ring jobs, and performance applications on Chevrolet 400 small block engines requiring .030 inch oversized rings. MAHLE's strict quality controls and premium materials ensure long service life and trouble-free operation.