MAHLE 40451-040 Premium Piston Ring Set 4.040" Bore .040" Oversize 8-Cylinder

The MAHLE 40451-040 Premium Piston Ring Set delivers OE-quality performance for 4.040" bore engines, providing a .040" oversize fitment for Small Block Ford 289/302/351/400, Chevrolet 327/350, and Chrysler 360 V8 engines. Engineered as a direct OE replacement, this 8-cylinder ring set combines advanced materials with precision manufacturing to ensure optimal sealing, reduced friction, and extended service life.

Advanced Ring Design:

• Pre-lapped rings seat immediately, virtually eliminating break-in time
• Barrel-faced compression rings with CNC-controlled gap chamfer optimize compression and reduce blow-by
• SAE 9254 high alloy steel construction provides superior tensile strength, yield strength, and material hardness
• Reverse twist intermediate rings deliver better groove side sealing and enhanced contact
• CP-20 oil ring assemblies feature exclusive 20-degree ear angle for superior cylinder wall sealing
• Ring dimensions: 5/64" top ring, 5/64" second ring, 3/16" oil ring thickness

Premium Materials and Coatings:

• Chrome-faced upper compression ring for wear resistance
• Cast iron lower compression ring for optimal oil control
• Stainless steel oil control ring with chemical polish for enhanced oil drain-back
• Optimized ring tension reduces friction while maintaining proper sealing

Designed for deep oil ring groove applications, this MAHLE ring set represents decades of OE engineering expertise. MAHLE serves as an original equipment manufacturer to the world's largest engine producers, bringing proven technology and unmatched quality to the aftermarket. Sold as a complete set for all 8 cylinders.