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Reciprocating internal combustion engine
L78
L78 air-cleaner decal
Layout
Configuration
Naturally aspirated 90° V8
Displacement
396–402 cu in (6.5–6.6 L)
Cylinder bore
4.094 in (104.0 mm) 4.126 in (104.8 mm)
Piston stroke
3.76 in (95.5 mm)
Cylinder block material
Cast iron
Cylinder head material
Cast iron, Aluminum
Valvetrain
OHV 2 valves x cyl.
Combustion
Fuel system
Carburetor
Fuel type
Gasoline
Cooling system
Water-cooled
Output
Power output
375–425 hp (280–317 kW)
The L78 was a Big-Block engine produced by Chevrolet between 1965 and 1970. Rated at 425 hp (317 kW) for its first year, the rating dropped to 375 hp (280 kW) in subsequent years (although there was no change in power). Between 1966 and 1969 it was the most powerful Regular Production Option engine available in Chevrolet's intermediate line, making it a highly-collectible muscle car engine today.
The L78 was a Big-Block engine produced by Chevrolet between 1965 and 1970. Rated at 425 hp (317 kW) for its first year, the rating dropped to 375 hp (280 kW)...
of these optional engines went to which body style. Chevrolet does report 17,176 L34 and 612 L78 engine options were sold in 1967 Chevelles, but there...
and found ways around the GM limit. Yenko ordered L78 equipped SS Camaros and swapped in the Chevrolet Corvette's L72 427 in³ (7.0 L) V8. The cars came...
improvements over the standard L78 400 Pontiac. One of the key upgrades were the 6x4 heads. The standard head seen on an L78 400 Pontiac was the low compression...
you could actually order a two-wheel drive Z71. L78: big block V8 engine by Chevrolet 9C1: Chevrolet police package Z71: Truck Sports Package Whipps,...
Mustang, it was introduced on February 23, 1967, five months after GM's Chevrolet division's platform-sharing Camaro. This also coincided with the release...
4-4-2 shared a modest facelift with other Cutlasses. It came with a 400 ci L78 V8 rated at 350 hp (261 kW)/440 lb•ft with a single four-barrel carburetor...
Turbo-Hydramatic transmission and wheel opening covers. Standard tire size was L78-15. Upholstery was vinyl or cloth. The Oldsmobile Ninety-Eight set another...
Global Information
L78