- Cam action locking provides secure engagement of the valve spring in the tool, enabling safe replacement of valve springs and valve stem seals through the cylinder head. - Installation tool for removing valve spring compressor components in OHV, OHC, and CHV engine configurations. - Professional grade valve spring compressor, designed for easy operation and precise control. - Enables removing valve springs and retainers by compressing the spring to expose the valve gap, facilitating removal of carbon deposits and servicing through the cylinder head. - Applications and compatibility: suitable for engines with OHV, OHC, and CHV configurations; designed for valve spring and retainer removal and related head service during engine maintenance or rebuilds. - Use scenarios: - Valve spring and retainer removal during engine rebuilds or head service on OHV/OHC/CHV engines. - Replacing valve springs and valve stem seals to restore valve operation and compression. - Camshaft upgrades or valve train maintenance that requires safe, controlled compression of valve springs.