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The connecting rod was also 400 specific being 5.565 in (141.4 mm) as opposed to the 5.7 in (144.8 mm) rod used in all other small-block Chevrolet engines. The 400 was made in 4-bolt main journal from 1970 to 1972 and in 2-bolt main journal from 1973 to 1979.
All generation-2 small-block Olds V8s used the same stroke of 3.385 in (86 mm). The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material ...
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.
Even with the benefit of today's technology (aftermarket rods and stroker cranks), the upper limit of a Y-block is about 348 cu in (5.7 L), while the Chevrolet could be modified well past the factory limit of 400 cu in (6.6 L). The result was the introduction in 1958 of the 332 CID "big block" Ford FE engine which ultimately grew to 428 cu in
The new logo formally adopts the Small Block name for the engines. The fifth generation of the iconic GM small block engine family features the same cam-in-block architecture and 4.4 in (110 mm) bore centers (the distance between the centers of each cylinder) that were born with the original small block in 1954.
Other than that, this engine is vastly different from the Gen-1 model. The Gen-1 engine is physically the size of a big-block Ford or GM engine, and is sometimes called a "big-block". The Gen-2 is closer to the physical size of U.S.-made small-block V8s except for the bore centers, which are the same as some big-block engines.
A 289 Ford small-block V8 in a 1965 Ford Mustang. The 289 cu in (4.7 L) V8 was introduced in April 1963, carrying the Challenger name over from the 260 [3] and replacing it as the base V8 for full-sized Fords. Bore was expanded to 4.00 in (101.6 mm), becoming the standard for most small block Ford engines. Stroke remained at 2.87 inches.
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
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