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The cooling fan is 11 in (280 mm) in diameter with 24 blades, and is made of steel. Cooling airflow is controlled by a large-diameter bellows thermostat that drives a ring-shaped air valve in the eye of the blower. The oil is cooled by a folded-fin cooler. The engine does not have a harmonic balancer.
Where an additional cooling fan is driven by the engine, this also tracks engine speed similarly. Engine-driven fans are often regulated by a fan clutch from the drivebelt, which slips and reduces the fan speed at low temperatures. This improves fuel efficiency by not wasting power on driving the fan unnecessarily.
Engine fan with viscous drive. A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
This model of Corvette is particularly derided for its poor performance. Edmunds.com named this model the 3rd worst Corvette of all time, [87] Time magazine listed it as one of the 50 worst cars of all time, and it is included in Automotive Atrocities! The Cars We Love to Hate by Eric Peters. Dan Neil wrote of the 1980 small block Corvette ...
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 C4 Corvette represented a clean break from the Zora Arkus-Duntov-designed C3, with a completely new chassis and sleeker, more modern but still evolutionary styling. It was the work of a team under chief Corvette designer Dave McLellan, who'd taken over from Duntov in 1975 — under the design direction of Irv Rybicki.
Chrome air cleaner lids and cast magnesium valve covers dressed up all engines. The light weight 4 into 1 stainless steel exhaust manifolds and computer control system introduced on the 305 cu in (5.0 L) California engines the previous year were now standard, as was an auxiliary electric engine cooling fan.
Chevrolet introduced the 350 cu in (5.7 L) LT-1 in 1970, making it available in both the Corvette and Camaro. It was an optional engine in the Corvette, and available as part of the high-performance ZR-1 option. Between 1970 and 1972, only 53 ZRs were produced, making it one of the rarest Corvettes.