These ring sets offer a unique combination of easy installation and improved performance. The compression ring features a unique barrel-faced sealing surface, which increases contact area for more efficient compression. The intermediate ring is a reverse-twist design for superior groove side sealing. Oil ring spacer features exclusive 20° ear angle for best possible sealing. CP- 20 rings feature CNC controlled gap chamfer for optimized compression and reduced blowby. All CP-20 ring sets are pre-lapped to seat immediately, virtually eliminating break-in time. 8 cylinder sets unless noted