View our Specials! Coupon Code: SaveIn2026
Looking for aftermarket parts to modify or upgrade your 1978 GMC C15 with valve springs, retainers? At Tunersports.com we carry a huge selection of the top name brand performance valve springs, retainer parts and accessories.
 OUT OF STOCK 732-1Upgrading to these 10°... COMP Cams Titanium Retainer Super Lock 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $60.89 |
 IN STOCK - DROPSHIPS 732-16Upgrading to these 10°... COMP Cams Titanium Retainers Super Lock 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $441.90 |
 OUT OF STOCK 732-4Upgrading to these 10°... COMP Cams Titanium Retainers Super Lock 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $145.95 |
 IN STOCK - DROPSHIPS 742-12Lock Angle - 11/32" Valve Stem Size - 1.250" Spring Diameter.... COMP Cams Steel Retainers 11/32in 1.250in 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $86.32 |
 IN STOCK - DROPSHIPS 26981-12With a .525" maximum lift, these Beehiveâ„¢ Valve Springs were designed for hydraulic or Solid flat tappet as well as hydraulic Roller cams. They work in most Small Block Chevy heads with no machining. COMP Cams Beehiveâ„¢ Valve Springs deliver increased valve train stability and a much ligh... COMP Cams Valve Springs 1.240in Beehive 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $199.76 |
 IN STOCK - DROPSHIPS 981-12Single Outer Valve Springs from COMP Cams allow you to build the perfect spring assembly for your application. The valve spring creation process is far more involved than most people realize. Selecting the right Metal stock and creating the best design is not done by chance. COMP Cams has developed ... COMP Cams Valve Springs 1.250in Outer 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $101.26 |
 SHIPS FROM MANUFACTURER 986-12COMP Cams Valve Springs For 984-974 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $110.44 |
 IN STOCK - DROPSHIPS 9731Edelbrock Valve Spring Retainers are made of superior quality steel and are machined and heat treated for maximum strength. They feature a black oxide finish to prevent rust and corrosion... Edelbrock Retainers for 5762 V/S 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $178.42 |
 IN STOCK - DROPSHIPS 5862The Edelbrock #5862 Sure Seat Valve Spring for Big-Block Chevy 396-402-427-454 V8 O.E Cast iron cylinder heads are made of highest quality spring wire and precision wound to close tolerances, our Sure Seat Valve Spring sets are for use on original equipment heads when installing Edelbrock Performer-... Edelbrock V/S Performer Chev 396-454 Non Rotator 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $135.16 |
 OUT OF STOCK 5895Edelbrock part #5895 Sure Seat Valve Spring Kit is designed for Big-Block Chevy 396-402-427-454 V8 engines with O.E Cast Iron Heads. Made of highest quality spring wire and precision wound to close tolerances. This Sure Seat Valve Spring set is for use on original equipment heads when installing Ede... Edelbrock V/S Perf Chev 396-454 Spring Kit 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $308.64 |