Ford Boss 302 engine

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Ford Boss 302 V8
Boss 302 engine
ManufacturerFord Motor Company
TypeSmall-block V8
SuccessorFord Boss 351 V8
Bore4 in (101.6 mm)
Stroke3 in (76.2 mm)
Displacement302 cu in (4.9 L)
ValvetrainOHV
Fuel systemNormally aspirated
Power outputUnderated at 290 hp (216 kW) @ 5900 RPM
Torque output290 lb·ft (393 N·m) @ 4300 RPM

The Boss 302 engine is a high-performance small-block V8 from Ford Motor Company. It was a hybrid of small-block Ford V8s - It used the block of the small Ford Windsor engine and the heads of the larger Ford Cleveland engine. It was created for the SCCA's Trans-Am road racing series, and was fitted to the Boss 302 Mustang.

The high nickel content block has a thicker deck, cylinder walls and beefy 4-bolt main caps. It is easily identified by screw in freeze plugs on the side of the block, pent roof valve covers, very wide heads and a very wide intake manifold. A Boss 302 has 8 valve cover bolts (because of the Cleveland heads) as opposed to the standard 302 having 7. The connecting rods are heavy, high strength steel forgings made for high rpm use. The crankshaft is a cross drilled high strength steel forging. The cam and lifters are high lift solid mechanical units.

The unique, wide, large port Cleveland style heads with staggered valve placement are what give the Boss 302 high power capabilities. Early units were typically characterized by very large intake and exhaust valves sitting in a small quench style combustion chamber.

The motor has a unique sound as a result of its solid lifter configuration. At idle, properly tuned, the engine has a great deal of 'chatter.'

See also