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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 Mustang Boss 302 is a high-performance 302 cu in (4.9 L) H.O. V8-powered variant of the Ford Mustang originally produced by Ford in 1969 and 1970. Developed to meet homologation requirements to compete in Trans Am racing, it was Ford's response to the success of the Chevrolet Camaro Z/28 in the 5 L (305.1 cu in) and under SCCA series since 1967.
The Boss 302 Mustang was offered only for the 1969 and 1970 model years. In the January 2010 issue of Hot Rod magazine, a Boss 302 engine built to the exact specifications, settings, and conditions of the original engine was tested. It produced 372 hp at 6,800 rpm (650 rpm over the original engine’s redline) and 325 lb-ft of torque at 4,200 rpm.
1968–1997 385 V8—big-block (370/429/Boss 429/460/514) 1975–2007 Ford-Cosworth Indy V8 engine (U.S.A.C. IndyCar engine) 1970–1982 335/Cleveland V8— small-block (351 Cleveland/400/351M/Boss 351) 1969–1982 Ford Australia produced Cleveland V8 engines 302/351 (Geelong plant) 1983–2010 Ford/Navistar Diesel V8
It was based on the Mustang SportsRoof model and replaced both the Boss 302 and the Boss 429 models. The Boss 351 engine was a 351 Cleveland four barrel engine with a mechanical cam, solid lifters, 11.0:1 compression ratio, aluminum intake, and a 4 bolt main bearing block. It was topped with an all-new 750 CFM Ford 4 barrel carburetor.
The Boss 429 was produced in limited numbers in 1969 and 1970. Its origin is twofold: allow Ford to homologate its new Ford 385 engine-based semi-hemispherical 429 V8 for NASCAR racing, and to provide a big block alternative to the 5.0 L and under Trans Am Racing bred small block Boss 302 Mustang.
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The January 2010 issue of Hot Rod reported a project in which a Boss 351 was assembled to the exact internal specifications of an original motor, but fitted with open, long tube, 1-3/4-inch Hooker headers (vs. the stock cast-iron manifolds), a facility water pump, a 750 Holley Street HP-series carburetor (vs. the stock 715 CFM Autolite unit ...