There is speculation over whether this engine actually put out 450 hp (336 kW) gross, or if this was a marketing oversight that was later corrected. The first iteration of the W-series engine was the 1958 "Turbo-Thrust" 348-cubic-inch (5.7 L), originally intended for use in Chevrolet trucks but also introduced in the larger, heavier 1958 passenger car line. It was gradually replaced by the third generation 230, beginning in 1962. This is a raised-deck engine. Beginning in 1969, the highest performance 427 models were fitted with the new open (vs. closed) chamber cylinder heads, along with design improvements in crankshafts, connecting rods, and pistons, adopted from the Can-Am development program. It was also used by Chevrolet and GMC trucks, primarily for the half-tons. Same as 396 cu in (6.5 L) L-34. It was originally designed for the GMC military M135 and M211. It was already used in light trucks as the A and Chevrolet Veraneio. It quickly homologated a version with four-barrel carburetor, called "Quadrijet" in Brazil (no relationship to GM's own Rochester, Holden Abroad, Restored Cars #220, Sep-Oct 2013, page 45, 1970 Holden HT Brougham, Restored Cars #174, Jan-Feb 2006, pages 27 to 28, Learn how and when to remove this template message, 153 cu in (2.5 L) inline four-cylinder engine, Studebaker Commander, Daytona ('66 only), Cruiser and Wagonaire, Studebaker Commander, Wagonaire, Daytona and Cruiser, 350-cubic-inch (5.7 L) Chevy small-block V-8, "Vauxhall T car - Opel K180 & GMC Chevette in Argentine",, Articles needing additional references from December 2009, All articles needing additional references, Articles with unsourced statements from April 2019, Wikipedia articles needing clarification from April 2019, Articles with unsourced statements from September 2012, Articles with unsourced statements from August 2017, Articles with unsourced statements from December 2012, Articles with disputed statements from December 2012, Articles with unsourced statements from October 2012, Creative Commons Attribution-ShareAlike License. In the 1963 model year, output reached 425 bhp (431 PS; 317 kW) @ 6000 rpm and 425 lb⋅ft (576 N⋅m) @ 4200 rpm of torque with the Rochester 2X4-barrel carburetor setup, a compression ratio of 11:1 and a solid lifter camshaft., all rights reserved. For those who don’t, and wondered what it was, here it is: Bore squared (bore X bore), times Stroke, times Pi (3.14), times # of cylinders, divided by 4. This newly revised engine put out 80 hp (60 kW). Bore and stroke was 4 1 ⁄ 8 in × 3 1 ⁄ 4 in (104.8 mm × 82.6 mm), resulting in a substantially oversquare design. A 181-cubic-inch (3.0 L) (3.3125 by 3.5 inches (84.14 mm × 88.90 mm) version was used by Chevrolet in the Master series of cars in 1935 and 1936. The 454 EFI version was rated from 230 hp (172 kW) to 255 hp (190 kW) and from 385 lb⋅ft (522 N⋅m) to 405 lb⋅ft (549 N⋅m) of torque. For 1959 and 1960, high-output versions of the top two engines were produced with 320 hp (239 kW) and 335 hp (250 kW) respectively. When broken down, GM's 8.1L is largely a stroked out version (4.00" vs 4.37") of the company's 7.4L Vortec V-8, which was retired in favor of the 496 cubic inch behemoth. This engine was superseded by the 409 cu in (6.7 L) as Chevrolet's top performing engine in 1961 and went out of production for cars at the end of that year. The last L18 was manufactured in December 2009. There were smooth running versions with hydraulic lifters suitable for powering the family station wagon, as well as rough-idling, high-revving solid lifter models usually applied to a minimally equipped, plain-looking, two-door Biscayne sedan fitted with the 425 hp (317 kW) version of the 427 - (RPO L72). This engine was identical to the 425 hp (317 kW) L72 427 (first introduced in 1966), but was fitted with 3X2-barrel Holley carburetors,[14] known as "Tri-Power", in lieu of the L72's single 4-barrel carburetor. "There is no substitute for raw cubic inches." Both engines share a 4.25 inch bore, and the undersquare design of the 8.1L improves low end torque and helps flatten the torque curve, both of which are ideal characteristics for a heavy truck engine. A cubic inch is a 1x1x1 inch box. Bore and stroke are 3.875 in × 3.25 in (98.4 mm × 82.6 mm). L-35: produced 1965–9, had 10.25:1 compression, Q-jet carburetor, forged steel (1965-7) or nodular iron (1968-9) crankshaft, hydraulic lifters, oval port closed chamber heads, and two-bolt main caps. Mark IV engines also found themselves widely used in power boats, a natural application for these robust power plants. It had a bore x stroke of 4.094 in × 3.760 in (104 mm × 95.5 mm),[10][11] and produced 375 bhp (380 PS; 280 kW) at 5600 rpm and 415 lb⋅ft (563 N⋅m) of torque at 3600 rpm. It was completely phased out in North America by 1990; in Brazil, GM held on to their fuel-injected version through the 1998 model year. Just two production Corvettes (factory option at dealer) and 69 Camaros (non-dealer option from factory - COPO 9560) were built with the ZL1. GMC as a marque really only produced a few engine designs, the straight six, a V8, and a V6 which was also available as a V12 for a brief period.

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