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The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
Introduced in 1963 on Pontiac's 389 and 421 cu in (6.4 and 6.9 L) drag racing engines, General Motors fitted it to the 1967 Z/28 before they used it on the L88 427 cu in (7.0 L) Corvette. It eliminated the production breaker-point ignition allowing greater spark energy and more stable ignition timing at all engine speeds including idle.
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
Power and performance were reduced. Engine offerings for 1971 included the 250-6, small-block V8s of 307 and 350 cubic inches; and big block V8s of 402 and 454-cubic-inch displacements. Horsepower ratings of those engines for 1971 ranged from 145 for the six to 365 for the RPO LS5 454 – all in gross figures. The LS6 454 V8 was gone forever.
The standard engine was 350 cu in (5.7 L) producing 145 hp (108 kW) with a 2-barrel carburetor, with options for a 150 hp (112 kW) 2-barrel or 180 hp (134 kW) 4-barrel 400 cu in (6.6 L) V8, and a 230 hp (172 kW) 454 cu in (7.4 L) V8, except in California where a 155 hp (116 kW) 350 four-barrel V8 was standard. The 400 and 454 engines were optional.
The third-generation C/K was introduced for the 1973 model year. Designated the "Rounded Line" generation by General Motors, the C/K grew in size inside and out. As pickup trucks increased in use as personal vehicles, cab features and options moved closer in line with GM sedans (with power windows and power door locks becoming options). To ...
400 cu in (6.6 L) V8 GM Generation V small-block V8: 2021–present (L8T) Replaced 6.0L V8 First V8 direct-injection gasoline engine used by model line Available only on 2500 and 3500 vans, and standard on the 4500 chassis 454 cu in (7.4 L) V8 Chevrolet Generation VI big-block V8: 1996–2000 (L29) Vortec 7400, replaced by 8.1L V8
The division offered its conventional school bus chassis with Chevrolet-produced engines, including the 250 inline-6 (replaced by the 292 inline-6), 366 V8, and 427 V8. [1] In both Chevrolet and GMC school buses, the Allison AT475 3-speed automatic transmission became an option in 1971 with single or two-speed rear axles.