Ford Boss 302 engine
| Ford Boss 302 V8 (1969-70 Version) | |
|---|---|
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| Overview | |
| Manufacturer | Ford Motor Company |
| Combustion chamber | |
| Displacement | 302 cu in (4.9 L) |
| Cylinder bore | 4 in (102 mm) |
| Piston stroke | 3 in (76 mm) |
| Valvetrain | OHV |
| Combustion | |
| Fuel system | Normally aspirated |
| Output | |
| Power output | 290 hp (216 kW) @ 5200 rpm |
| Torque output | 290 lb·ft (393 N·m) @ 4300 rpm |
| Chronology | |
| Successor | Ford Boss 351 V8 |
The Ford Boss 302 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 was constructed by attaching heads designed for the planned 351 Cleveland (which debuted the following year) to a Windsor engine block. The construction was aided by the two engines sharing a cylinder head bolt pattern, though the Boss heads had to have their coolant passages slightly modified.
An entirely new Boss 302 engine was introduced for the 2012 Ford Mustang using a variant of the Ford Modular engine.
The 1969-70 Boss 302 engine was created in 1968 for the SCCA's 1969 Trans-Am road racing series. Fitted to the factory-made Boss 302 Mustangs of 1969-70, it is a unique Ford small-block featuring a thin-wall high nickel content casting. It differed substantially from regular 302s, with 4-bolt mains, screw in freeze plugs, higher nickel content, and heads using a canted valve design being developed for the 351C, which made its debut in late 1969 Mustangs).
The high nickel content block had a thicker deck, and a taller intake manifold due to the heads. It also had a distinct harmonic balancer, crankcase windage tray, bigger diameter alternator pulley (from the 289HIPO), and bigger diameter power steering pulley all to accommodate the higher RPM capabilities of the engine vs a standard 302. The engine also came with an engine RPM limiter (to protect the owner's warranty options but was often one of the first things removed). The Boss 302 has eight valve cover bolts; in '69 they were chrome and in '70 cast aluminum, while the standard 302 has six. The connecting rods are the same as used in the 289 HIPO, and have an engineering number of C3AE-D on them. They are capable of higher RPMs than standard 302 rods (up to ~8k RPM), aided by a spot face for 3/8 inch bolts with a unique football-shaped head (vs 5/16 for standard small blocks), and beefier cap. The crankshaft is cross drilled (this was changed in 1970 for better reliability) high strength steel forging. The cam and lifters are high lift, solid mechanical units. The cam featured 290 degrees duration and .477 inches of lift.
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Wikipedia