Looking for aftermarket parts to modify or upgrade your GMC C15 with gasket kits? At Tunersports.com we carry a huge selection of the top name brand performance gasket kit parts and accessories for your C15.
Whether you have a 1975 or 1978 GMC C15 in Base to Street Coupe trim we have you covered. We have 21 gasket kits available to mod your C15. All parts have free shipping to the Continental US 48 States.
 SHIPS FROM MANUFACTURER C15550Cometic Chevrolet Gen-IV Big Block V8 One Piece Molded Rubber Oil Pan Gasket 1965-1990 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $71.58 |
 SHIPS FROM MANUFACTURER PRO1003BCOMETIC StreetPro Kits cater to the budget-minded street-rodder who is looking to purchase a kit with all necessary gaskets and seals needed for their rebuild. Quality gasket materials are a priority in StreetPro kits. Kit materials include: MLS, AFM, Aramid Fiber, and Armor Clad.... Cometic Street Pro GM 1967-88 350ci 1970-76 400ci Small Block Bottom End Gasket Kit 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $97.68 |
 IN STOCK - LOW PRO1005BCOMETIC StreetPro Kits cater to the budget-minded street-rodder who is looking to purchase a kit with all necessary gaskets and seals needed for their rebuild. Quality gasket materials are a priority in StreetPro kits. Kit materials include: MLS, AFM, Aramid Fiber, and Armor Clad.... Cometic Street Pro GM 1970-85 454ci Big Block Bottom End Gasket Kit 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $69.89 |
 SHIPS FROM MANUFACTURER PRO1005TCOMETIC StreetPro Kits cater to the budget-minded street-rodder who is looking to purchase a kit with all necessary gaskets and seals needed for their rebuild. Quality gasket materials are a priority in StreetPro kits. Kit materials include: MLS, AFM, Aramid Fiber, and Armor Clad.... Cometic Street Pro GM 1970-85 454ci Big Block 4.375 Top End Gasket Kit 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $210.09 |
 SHIPS FROM MANUFACTURER PRO1040TCometic Street Pro 01-10 GM LS 4.8L / 5.3L / 3.840in Truck Suv Top End Gasket Kit 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1978-1978 GMC C15 Heavy Half / Street Coupe $371.54 |
 SHIPS FROM MANUFACTURER C5377COMETIC Front and Rear Main Crank Seals are manufactured from the best materials available and are suited for all types of environments. Each seal meets or exceeds OEM quality. For Jesel Belt Drive. Ok for wet or dry sump systems... Cometic Chevy Mark IV Big Block V8 Timing Cover Seal Jesel Belt Drive Dual Lip Wet & Dry Sump 86622 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $87.23 |
 SHIPS FROM MANUFACTURER C5381COMETIC Front and Rear Main Crank Seals are manufactured from the best materials available and are suited for all types of environments. Each seal meets or exceeds OEM quality. Ok for wet or dry sump systems... Cometic Chevy Mark IV Big Block V8 Rear Main Seal 2 Pc Double Split Seal Wet & Dry Sump 86665 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $106.14 |
 SHIPS FROM MANUFACTURER 6950Edelbrock replacement gaskets are made to our high standards of quality and performance. Theyre the same high quality gaskets that we supply with our intakes, heads, carbs and other components.... Edelbrock Gasket 7110 (5Pr) 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $61.57 |
 SHIPS FROM MANUFACTURER 6998Edelbrock replacement gaskets are made to our high standards of quality and performance. Theyre the same high quality gaskets that we supply with our intakes, heads, carbs and other components.... Edelbrock Gasket Kit Front Cover Big Block Chevrolet 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $57.41 |
 SHIPS FROM MANUFACTURER 6999Designed for 302-327-350-400 c.i.d. small-block Chevy V8s operating below 7500 rpm where low-end torque is not a prime factor. Great for engines with slightly modified heads. Applicable to street machines, street rods, pro street and marine.... Edelbrock Gasket 7110 (1Pr) 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $46.38 |
 SHIPS FROM MANUFACTURER 7202These gaskets feature Micropore MP-2N an ultra-modern environmentally safe gasket material provides excellent sealing on rough, irregular flange surfaces.... Edelbrock BBC Square Intake Gasket 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $54.60 |
 SHIPS FROM MANUFACTURER 7203These gaskets feature Micropore MP-2N an ultra-modern environmentally safe gasket material provides excellent sealing on rough, irregular flange surfaces.... Edelbrock BBC Oval Intake Gasket 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $61.08 |
 SHIPS FROM MANUFACTURER 7205Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrocks gaskets are not only manufactured from extremely high quality materials, but theyre also designed specifically to fit our intakes and cylinder heads, so theres no chance th... Edelbrock BBC Exhaust Gasket 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $59.17 |
 SHIPS FROM MANUFACTURER 7208These gaskets feature Micropore MP-2N an ultra-modern environmentally safe gasket material provides excellent sealing on rough, irregular flange surfaces.... Edelbrock Gasket Intake Big Block Chevy Rect Port 6-Bolt Flange 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $58.66 |
 SHIPS FROM MANUFACTURER 7215These gaskets feature Micropore MP-2N an ultra-modern environmentally safe gasket material provides excellent sealing on rough, irregular flange surfaces.... Edelbrock Gasket Intake Chevy Small Block Edelbrock 200 E-Tec Cylinder Heads 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $73.36 |
 SHIPS FROM MANUFACTURER 7252These Edelbrock water pump gaskets will keep your water pump leak-free. They are manufactured from quality materials and can be installed easily without any modifications.... Edelbrock Gasket Kit Water Pump BBC 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $44.32 |
 SHIPS FROM MANUFACTURER 7302Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrock's gaskets are not only manufactured from extremely high quality materials, but they're also designed specifically to fit our intakes and cylinder heads, so there's no chance... Edelbrock BBC Head Gasket 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $90.99 |
 SHIPS FROM MANUFACTURER 7362Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrock's gaskets are not only manufactured from extremely high quality materials, but they're also designed specifically to fit our intakes and cylinder heads, so there's no chance... Edelbrock BBC Square Head Gasket Set 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $149.53 |
 SHIPS FROM MANUFACTURER 7363Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrock's gaskets are not only manufactured from extremely high quality materials, but they're also designed specifically to fit our intakes and cylinder heads, so there's no chance... Edelbrock BBC Oval Head Gasket Set 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $167.88 |
 SHIPS FROM MANUFACTURER 7376Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrock's gaskets are not only manufactured from extremely high quality materials, but they're also designed specifically to fit our intakes and cylinder heads, so there's no chance... Edelbrock Gaskets Cylinder Head Gasket Set BBC Gen V and Vi 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $214.41 |
 SHIPS FROM MANUFACTURER 7580Fabricated from performance CRC (core-reinforced-composite), Edelbrock Valve Cover Gaskets provide excellent sealing integrity and conformability for easy installation.... Edelbrock BBC Valve Cover Gasket 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1977 GMC C15 Indy Hauler 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $77.74 |