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The engine block had 4.84-inch (123 mm) bore centers, two-bolt main bearing caps, a "side oiling" lubrication system (the main oil gallery located low on the driver's side of the crankcase), with full-flow oil filter, and interchangeable cylinder heads. Heads used on the high performance 409 and 427 engines had larger ports and valves than ...
The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
A rocker cover gasket (valve cover gasket in the US and Canada) is used to seal the joint between the cover and engine head. Failure of the gasket can cause oil to leak from the engine. A head gasket is used to seal the joint between the head and the engine block.
No gas lid emblem was used. Aluminum front grills (all-black), dual exhaust resonators added, revised radiator cooling and interior a/c ducts, and integrated seat/shoulder belts in the coupe. Last year for a true dual exhaust system, last year for the 454 big-block engine in a Corvette, which was the 270 hp LS4. 1975: 38,465
The 5.7-liter DOHC 32-valve LT5 engine unique to the car had a central bore spacing of 4.40 inches. The distance was maintained by reducing the bore from 4.00 to 3.90 inches while the stroke was increased from 3.48 to 3.66 inches. The aluminum cylinder liners were Nikasil-coated and the engine block has a cast-aluminum oil sump.
The 1965 Corvette Sting Ray became ferocious with the mid-year debut of the "Big-Block" 396 cu in (6,490 cc) engine producing 425 hp (317 kW). Ultimately, this spelled the end for the Rochester fuel injection system, as the carbureted 396ci/425hp option cost $292.70 to the fuel injected 327ci/375hp's $538.00.