BBC R/Z Roller Lifters - .936

The BBC R/Z Roller Lifters - .936 from ISKY CAMS are precision-engineered valvetrain components built for serious Big Block Chevrolet enthusiasts and professional engine builders. These roller lifters are designed to replace traditional flat-tappet lifters in R/Z cylinder head applications, delivering reduced friction, improved reliability, and extended service life in high-rpm and high-horsepower builds.

Roller lifters eliminate the sliding friction inherent in conventional flat-tappet designs by using a precision-machined roller bearing that rides against the camshaft lobe. The .936-inch diameter specification matches BBC R/Z head bore requirements precisely, ensuring zero clearance issues and optimal contact geometry. ISKY CAMS manufactures these lifters to strict tolerances using hardened steel construction, which resists wear under sustained high-load cycling and aggressive valve timing events.

BBC R/Z Roller Lifters - .936 are essential for builders running aggressive solid-roller or hydraulic-roller camshafts above 5500 rpm, as well as anyone converting a stock engine to a performance setup. The roller design reduces parasitic drag on the camshaft, allowing more valve lift energy to transfer directly to opening the intake and exhaust valves—a measurable advantage in peak flow and combustion efficiency.