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The Ford Boss 302 (formally the "302 H.O.") is a high-performance "small block" 302 cu in (4.9 L) V8 engine manufactured by Ford Motor Company.The original version of this engine was used in the 1969 and 1970 Boss 302 Mustangs and Cougar Eliminators and was constructed by attaching heads designed for the planned 351 Cleveland (which debuted the following year) to a Ford small block. [1]
The heads from the Boss 302 became the production heads on the 335-series 351 cu in (6 L) "Cleveland" engines, which used the same bore spacing and head bolt configuration as the small block engines. As the 1980s drew to a close, Ford began the design of a new OHC V8 to replace the venerable small block design.
Note: this is commonly called the Ford Small-block V8 pattern, though it is used in some "big block"-sized V8's as well as some V6's and I6's. 200 I6 1978-1983 only, partial (4 of 6 bolts) pattern. 250 I6 (except Australian 250/4.1) 255 V8; 289 V8 - (made after August 3, 1964) - had 6 bolts holding bellhousing to block; 302 Cleveland (Australia)
The rocker arm design was originally used by the Ford 385 series engines. [4] However, the Boss 351 and 351 HO had an adjustable valve train, using rocker arms mounted on screw-in studs and guide plates. [1] [10] Prior to the release of the 351C, the 335 Series cylinder head was used on the Ford Boss 302 engine. [4]
The first Y-block on Ford automobiles and F100 trucks was the 239 cu in (3,910 cc) version as released in 1954 with EBU casting numbers. The Y-block was the same displacement as the old Ford Flathead V8 that it replaced but with a bigger bore and a shorter stroke (3.5 x 3.1 in).
In 1948, Ford raised the compression of the flathead six or L-6 (designated H-series or Rouge 226) so that it generated 95 hp (71 kW) and 180 lb⋅ft (244 N⋅m) of torque. The G- and H-series engines were used in the full-sized Ford cars and trucks to replace the smaller 136 cu in (2.2 L) Flathead V8 that was used in the 1937 Ford. Ford ...
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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).