8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.500" Guides)

Brand:	Speedmaster
Part Number:	PCE354.1004
Part Type:	Valve Stem Seal
Valve Stem Diameter:	8mm
Valve Stem Seal Type:	Positive stop
Valve Stem Seal Material:	VitonÂÃ rubber
Machine Work Required:	No
Valve Guide Diameter (in):	0.500 in.
Valve Stem Seal Outside Diameter (in):	1.190 in.
Quantity:	Sold as a set of 16.
Notes:	Designed for Chevrolet LS

Valve stem seals control the lubrication of the valve stem as it slides in the valve guide. Too little oil causes stem and guide wear. Too much oil increases oil consumption and can cause a buildup of carbon, leading to valve seat damage and early valve grind. Speedmaster valve seals are posi-stop seals made from high-temperature Viton material for a long-lasting seal.