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Looking for aftermarket parts to modify or upgrade your 1978 GMC C15 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 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $33.44 |
 IN STOCK - DROPSHIPS 503-12COMP 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 Metal W/Pt 1975-1978 GMC C15 Base / High Sierra 1977-1978 GMC C15 Heavy Half $49.46 |