View our Specials! Coupon Code: SaveIn2026
Looking for aftermarket parts to modify or upgrade your 1978 GMC C15 with valves? At Tunersports.com we carry a huge selection of the top name brand performance valf parts and accessories.
 IN STOCK - DROPSHIPS 6021-8COMP Cams Sportsman Stainless Steel Valves are available in a variety of diameters and stem lengths for Street/Competition engines. Made from 21-4N forged high-strength Steel alloy with 50 HRc minimum hard tips (eliminates the need for a lash cap), these valves are state-of-the-art, delivering treme... COMP Cams Ss Valves BBC Int 2.300in 11/3 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $173.65 |
 IN STOCK - DROPSHIPS 6022-8COMP Cams Sportsman Stainless Steel Valves are available in a variety of diameters and stem lengths for Street/Competition engines. Made from 21-4N forged high-strength Steel alloy with 50 HRc minimum hard tips (eliminates the need for a lash cap), these valves are state-of-the-art, delivering treme... COMP Cams Ss Valves BBC Int 2.250in 11/3 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $181.95 |
 IN STOCK - DROPSHIPS 6023-8COMP Cams Sportsman Stainless Steel Valves are available in a variety of diameters and stem lengths for Street/Competition engines. Made from 21-4N forged high-strength Steel alloy with 50 HRc minimum hard tips (eliminates the need for a lash cap), these valves are state-of-the-art, delivering treme... COMP Cams Ss Valves BBC Exh 1.880in 11/3 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $181.95 |
 IN STOCK - DROPSHIPS 6021-1COMP Cams Sportsman Stainless Steel Valves are available in a variety of diameters and stem lengths for Street/Competition engines. Made from 21-4N forged high-strength Steel alloy with 50 HRc minimum hard tips (eliminates the need for a lash cap), these valves are state-of-the-art, delivering treme... COMP Cams Ss Valve BBC Int 2.300in 11/32 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $47.42 |
 IN STOCK - DROPSHIPS 6022-1CPGCOMP Cams Ss Valve BBC Int 2.250in 11/32 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $47.42 |
 IN STOCK - DROPSHIPS 6023-1COMP Cams Sportsman Stainless Steel Valves are available in a variety of diameters and stem lengths for Street/Competition engines. Made from 21-4N forged high-strength Steel alloy with 50 HRc minimum hard tips (eliminates the need for a lash cap), these valves are state-of-the-art, delivering treme... COMP Cams Ss Valve BBC Exh 1.880in 11/32 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $46.15 |
 IN STOCK - DROPSHIPS 9716The Edelbrock #9716 Intake Valve Seat is a replacement for Edelbrock cylinder heads.... Edelbrock Intake Valve Seat - BBC 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $72.09 |