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Looking for aftermarket parts to modify or upgrade your 1981 GMC C2500 with valve seals? At Tunersports.com we carry a huge selection of the top name brand performance valve seal parts and accessories.
 IN STOCK - DROPSHIPS 501-12COMP Cams offers a complete line of valve stem Seals, from the stock GM "O-Ring" to the positive-stop PTFE Seal. These Seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The "O-Ring" Seals use the standard retainer and oil splash shi... COMP Cams Valve Seals 11/32in O Ring 1979-1982 GMC C2500 Sierra Grande 1979-1984 GMC C2500 Base / High Sierra / Sierra Classic $33.64 |
 IN STOCK - DROPSHIPS 501-16Fits: 11/32" Valve Stems / OE-Size Valve Guides (.400" Outer Diameter). Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guides. Use standard o-ring Seal retainer and oil splash shield. Requires no machining.... COMP Cams Valve Seals 11/32in O Ring 1980-1982 GMC C2500 Sierra Grande 1980-1986 GMC C2500 Base / High Sierra / Sierra Classic $35.45 |
 IN STOCK - DROPSHIPS 504-16Fits: 3/8" Valve Stems - OE-Size Valve Guides (.900" Outer Diameter). Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guides. Normally used when a larger-than-stock diameter spring is used. Requires no machining.... COMP Cams Valve Seals 3/8in UmBRella 1980-1982 GMC C2500 Sierra Grande 1980-1986 GMC C2500 Base / High Sierra / Sierra Classic $41.22 |
 IN STOCK - DROPSHIPS 505-16Fits: 3/8" Valve Stems - .530" Guides (.630" Seal Diameter). Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guides. Smaller diameter than COMP Umbrella Seals to allow use with double springs.... COMP Cams Valve Seals 3/8in PTFE 1980-1982 GMC C2500 Sierra Grande 1980-1986 GMC C2500 Base / High Sierra / Sierra Classic $55.81 |
 IN STOCK - DROPSHIPS 504-1Fits: 3/8" Valve Stems - OE-Size Valve Guides (.900" Outer Diameter)Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guidesNormally used when a larger-than-stock diameter spring is usedRequires no machining.... COMP Cams Valve Seal 3/8in UmBRella 1980-1982 GMC C2500 Sierra Grande 1980-1986 GMC C2500 Base / High Sierra / Sierra Classic $28.48 |
 IN STOCK - DROPSHIPS 505-1Fits: 3/8" Valve Stems - .530" Guides (.630" Seal Diameter)Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guidesSmaller diameter than COMP Umbrella Seals to allow use with double springs... COMP Cams Valve Seal 3/8in PTFE 1980-1982 GMC C2500 Sierra Grande 1980-1986 GMC C2500 Base / High Sierra / Sierra Classic $29.44 |