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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 engine is gradually replacing the 4.6 L and 5.4 L Modular V8 units in all Ford vehicles. This is the first time that Ford has used the "5.0" designation since the pushrod 5.0 was discontinued and replaced by the 4.6 L Modular unit in the mid-90s. Vehicles equipped with the 32-valve DOHC Ti-VCT 5.0 L include the following:
5.0 HO in a Ford Mustang. The 1982 model year brought a new 5.0 High Output variation of the 302. Manual-transmission equipped Mustangs and Mercury Capris were first equipped with two-barrel carburetors (1982), then a four-barrel Holley carburetor (1983–85). The block was fitted with revised, taller lifter bosses to accept roller lifters, and ...
The last regular application of the 312 V8 in the U.S. was for certain 1960 Mercury models. Though considered to be a high-performance engine in 1956 and 1957, it was downgraded to an "economy" engine with low compression and two-barrel carburetor by 1960. Ford pickups used the 292 cu in (4.8 L) version as late as 1965.
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.
Fiat – Controlled High Turbulence (1989–92, Fiat Croma CHT), StarJet engine, dubbed Port Deactivation (PDA), Variable Intake System on the 131HP 1.8 16V and on the 155 HP 2.0 20V Pratola Serra engine. Ford — Dual-Stage Intake (DSI), on their Duratec 2.5 and 3.0-litre V6s, and it was also found on the Yamaha V6 in the Taurus SHO.
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 intake air must therefore have a special swirl or tumble movement in order to direct the fuel towards the spark plug. This swirl or tumble movement must be retained for a relatively long period of time, so that all of the fuel is getting pushed towards the spark plug. This however reduces the engine's charging efficiency and thus power output.