The Ford Boss 351 is a modified 351 cu in (5.8 L) 335 "Cleveland" V8 fitted with 4V (4V meaning 4 venturi (barrel) carburetor, not 4 valves) style closed-chambered 351C heads. Available only in 1971 production, it uses the basic four-bolt Cleveland block and crankshaft but both are constructed from high-strength nodular iron. The cylinder head is modified for better airflow and solid lifters. Aluminum valve covers added to the look. The forged connecting rods were shot-peened and magnafluxed for strength, and forged domed pistons gave an 11.3:1 nominal (11.1:1 advertised) compression ratio.
- Bore/stroke ratio: 1.14:1
- Bore spacing: 4.38 in (111.3 mm)
- Connecting rod length: 5.78 in (146.8 mm)
- Compression ratio: 11.3:1 (64.6-67.6 cc quench type chambers)
- Piston compression height: 1.631 in (41.4 mm)
- Carburetor: Autolite 4V, spread bore, 750 cu ft/min
- Fuel: Premium leaded
- Valve lash cold: .022 in (0.6 mm) intake and exhaust, .025 hot
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