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This engine was made from the 1960s until 2004. The 366 used 4 rings on the pistons, as it was designed from the very beginning as a truck engine. The 366 was produced only as a tall-deck engine, with a deck 0.4 in (10 mm) taller than the 396, 402, and 454 short-deck big-blocks.
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).
Between 1966 and 1969 the L78 was the highest-horsepower engine available in Chevrolet's intermediate line via a Regular Production Option (RPO). Despite this, in 1969 an L72 427 cu in (7.0 L), 425 hp (317 kW) engine could be ordered in an intermediate via a Central Office Production Order (COPO).
It was released one year earlier than the tall deck 425, and debuted the standard 3.385 in (86.0 mm) stroke; bore was 3.938 in (100.0 mm). 330s were painted gold and had forged steel crankshafts. The 4-barrel versions had a larger diameter harmonic damper, the 2 barrel only a balancer hub without the rubberized outer ring.
With the Chevrolet `140 1st-design off-road cam, the package increased a stock 302's horsepower from 360 hp (268 kW) to approximately 400 hp (298 kW). Chevrolet went so far as to carry the positive crankcase ventilation system (PCV) over to the cross-ram induction system to retain emissions compliance mandated for U.S.-produced cars beginning ...
For the 1969 model year the ZL1 option was offered featuring an all-aluminum 427 cu in (7.0 L) big-block engine listed at 430 hp (321 kW) gross , but reported to produce 560 hp (418 kW), that propelled the car through the 1 ⁄ 4 mile (0.40 km) in 10.89 seconds. [47]
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The exception was the optional 425 hp (317 kW) 427 cu in (7.0 L) Turbo Jet V8 was no longer listed, leaving the 385 hp (287 kW) 427 as the top engine. The three-speed Turbo Hydramatic transmission that previously only available with the 396 cu in (6.5 L) and 427 cu in (7.0 L) V8s was now optional with the 275 hp (205 kW) 327 cu in (5.4 L) Turbo ...