Kit includes aluminum top collars and valve springs. High performance spring kit that can be used in all applications from stock to .550" lift cams.

Note: Lower collars and valve keys / valve keepers must be re-used.

Note: Panhead may require clearancing between rocker cover and top collar.

Note: L81-84 Shovelhead must use stock style lower collars (18222-81) or purchase them separately as MCS 982281.