Looking for aftermarket parts to modify or upgrade your 1978 GMC C15 with heads? At Tunersports.com we carry a huge selection of the top name brand performance head parts and accessories.

IN STOCK - DROPSHIPS 50459The Edelbrock #50459 E-Street cylinder 290 Oval Port head is designed for Big-Block applications. The Edelbrock E-Street cylinder head offers American made quality and affordable performance. E-Street cylinder head features as-cast ports and are designed for entry-level street performance applicatio... Edelbrock Cyl Head E-Street BB Chevy Oval Port Complete Single 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,366.49 |

IN STOCK - DROPSHIPS 60909The Edelbrock #60909 Performer cylinder head is designed for 302, 327, 350 and 400 cid small-block Chevy engines up to 1986. This cylinder head includes your choice of 64cc (In order to retain stock compression ratio on 1970 and earlier small-blocks) or 70cc combustion chambers and high flow intake ... Edelbrock Single Perf SBC 64cc Head Comp 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,088.97 |

OUT OF STOCK 60435The Edelbrock #60435 Performer RPM High-Compression O-Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60435 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder he... Edelbrock Cylinder Head BBC Performer RPM Oval Port 100cc Complete Single w/ Springs 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,280.80 |
IN STOCK - DROPSHIPS 60439The Edelbrock #60439 Performer RPM High-Compression O-Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60439 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder he... Edelbrock Cylinder Head BBC Performer RPM Oval Port 100cc Complete Single w/ Springs 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,266.41 |
IN STOCK - DROPSHIPS 60455The Edelbrock #60455 Performer RPM O-Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60455 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delivers great... Edelbrock Cylinder Head BBC Performer RPM Oval Port for Hydraulic Roller Cam Natural Finish (Ea) 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,296.48 |
IN STOCK - DROPSHIPS 60459The Edelbrock #60459 Performer RPM O-Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60459 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delivers great... Edelbrock Single Perf RPM 454-0 BBC O-Port Head Comp 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,310.43 |
IN STOCK - DROPSHIPS 60499The Edelbrock #60499 Performer Bare High Compression cylinder head is designed for Big-Block Chevy Oval Port V8 applications. These Edelbrock Performer Series cylinder head is 50-state street legal and provide outstanding performance from Idle-5,500 RPM's. The Edelbrock Performer head is perfect for... Edelbrock Single BBC Hi-Comp 454-0 Head Comp 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,280.80 |
IN STOCK - DROPSHIPS 60549The Edelbrock #60549 Performer RPM Bare Rectangle Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60547 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head d... Edelbrock Single Perf RPM BBC Rect Port Head Bare 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $818.06 |
IN STOCK - DROPSHIPS 60555The Edelbrock #60555 Performer RPM Rectangle Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60555 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delive... Edelbrock Cylinder Head BBC Performer RPM Rectangle Port for Hydraulic Roller Cam Complete (Ea) 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,289.79 |
IN STOCK - DROPSHIPS 60559The Edelbrock #60559 Performer RPM Rectangle Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60559 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delive... Edelbrock Single Perf RPM BBC Rect Port Head Comp 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,255.53 |

OUT OF STOCK 2088Edelbrock part #2088 Performer Top End Kit is designed for 1957-86 Small-Block Chevy engines. This Top End Kit produced 363 HP & 405 TQ on a 350 c.i.d engine with 9.0:1 compression. The kit includes Performer EPS intake manifolds, E-Tec 170 cylinder heads, pushrods and Rollin' Thunder Hydraulic Roll... Edelbrock Power Pkg Top End Kit SBC 363 Hp 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $5,011.95 |

OUT OF STOCK 61259Edelbrock part #61259 Victor Jr. 23deg 220 cylinder head is designed for small-block Chevy Its 64cc combustion chamber yields around 10:1 compression ratio in a typical flat-top application and about 12.5:1 when used with some of the most common 12cc dome pistons. One of the key features of the Vict... Edelbrock Cylinder Head Victor Jr SBC 23 Deg 220cc Complete for Solid Roller Cam 1975-1978 GMC C15 Base / High Sierra / Sierra Classic / Sierra Grande 1977-1978 GMC C15 Heavy Half 1978-1978 GMC C15 Street Coupe $1,646.94 |