A valve spring’s biggest enemy is heat generated from compression and extension cycling, friction between the coils on double and triple springs or the spring and dampener, and through absorption from the cylinder head; especially the exhaust spring being right over the exhaust port. A valve spring’s only cooling is achieved from oil splashed over it by the rocker arms.

HPC’s S01 Solid Dry Film Lubricant coating solves the heat problem through superior high pressure lubrication qualities and the ability to attract oil like a magnet. Valve springs coated with S01 can retain their seat pressure up to three times longer than uncoated valve springs.