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A 307 cu in (5.0 L) version was produced from 1968 through 1973. Engine bore and stroke was 3.875 in × 3.25 in (98.4 mm × 82.6 mm). All 307s had large 2.45-inch (62.2 mm) journals to accept the 327's crankshaft. Pistons used with the 307 share the same pin height as the 327 but retain the 283's bore size.
This engine was rated at 25 horsepower, but actually put out around 28. There was soon an "H" version designed for high rpm use. This version put out nearly 40 horsepower, while being rated at "25+". The Thunderbolt engine benefited from upgrades and updates, eventually becoming the Mark 40, Mark 50, and Mark 55 engines of the mid and late fifties.
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [63] 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.
The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine
Wards 10 Best Engines is an annual list of the ten "best" automobile engines available in the U.S. market, that are selected by Wards AutoWorld magazine. The list was started in 1994 for model year 1995, and has been drawn every year since then, published at the end of the preceding year.
Vortec is a trademarked name for a line of gasoline engines for General Motors trucks.The name first appeared in an advertisement for the 1985 model year 4.3 L V6 that used "vortex technology" to create a vortex inside the combustion chamber, creating a better air / fuel atomization. [1]
The larger displacement engine included a pioneering electronic fuel-injected (EFI) system named "Electrojector" version in 1957. All these engines share common external dimensions, lightweight - about 600 lb (270 kg) - forged crankshaft and rods, as well as most other parts. [7] The stroke for all Gen-1 V8s is 3 + 1 ⁄ 4-inch (82.6 mm).
The Chevrolet 90° V6 family of V6 engines began in 1978 with the Chevrolet 200 cu in (3.3 L) as the base engine for the all new 1978 Chevrolet Malibu.The original engine family was phased out in early 2014, with its final use as the 4.3 L (262 cu in) V6 engine used in Chevrolet and GMC trucks and vans.
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