SBC Cam Retainer Plate - 2nd Design ZZ3/ZZ4

The SBC Cam Retainer Plate – 2nd Design ZZ3/ZZ4 from Chevrolet Performance is a precision-engineered camshaft retaining plate engineered for small-block Chevy engines equipped with GM's ZZ3 and ZZ4 performance packages. This component manages camshaft axial movement during startup, warm-up, and high-RPM operation, preventing unwanted shaft drift that can compromise valve timing and engine efficiency. Manufactured from steel in natural finish, this OEM-specification plate features a 3.294-inch bolt center distance and delivers the reliability demanded in both street-performance and serious engine builds.

The retainer plate's precise bore diameter and bolt-hole geometry are critical to maintaining consistent camshaft preload across thermal cycles. In high-performance small-block builds, engine bay temperatures can swing 100+ degrees Fahrenheit during sustained driving, causing aluminum cylinder heads to expand and contract at different rates than the steel block. A properly fitted retainer plate prevents the camshaft from translating forward under these conditions, preserving lobe geometry alignment with valve lifters and rocker arms. The 2nd design variant incorporates refinements to bolt boss relief, allowing for easier installation without sacrificing clamping force.

This plate is essential for anyone running or rebuilding a ZZ3 or ZZ4 small-block engine—whether building a weekend street machine, a vintage restoration with modern performance internals, or a track-focused application. It pairs directly with the corresponding camshaft and timing cover assembly used in these engine packages. If you're sourcing OEM Chevrolet Performance components for a complete engine build or refresh, this retainer plate ensures proper camshaft control and long-term reliability at the foundation of your engine's valve train.