Chev GM LS Engine Comp Cams LS-Engine Plug Kit # CC251Chev GM LS Engine Comp Cams LS Engine Plug Kit # CC251 Engine Block Plug Kit GM LS Series Many LS engine builders and do it yourself performance enthusiasts focus on the major components, such as camshafts and cylinder heads, when building or upgrading an engine. It's easy to overlook the smaller parts until the final stages of the engine build. That's why COMP Cams developed this Engine Plug Kit. The new COMP Cams Engine Plug Kit for LS Engines