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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.
The L8T is the first (and so far, only) iron block member of the Gen V family, and is the successor to the 6.0L Gen IV L96. It shares its 103.25 mm (4.065 in) bore with other 6.2L V8s such as the L86, but with a longer stroke of 98 mm (3.9 in) to displace 6.564 L (400.6 cu in). [ 80 ]
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.
In August 1998, General Motors released the GMT800 generation of full-size pickups for the 1999 model year as the replacement for the fourth-generation C/K trucks introduced for 1988. The long-running C/K nomenclature was retired by Chevrolet in favor of a singular Chevrolet Silverado nameplate (as GMC had done in 1988 with the GMC Sierra).
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.
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
Chevrolet specifications included both "gross" and "net ... (6.6 L) and 454 cu in (7.4 L) V8s were discontinued. ... 5.7 L Gen III V8, the SS and Royale came with a ...