351 "R" 4V 1971-1972 Boss 351-HO
Engine Type 8 cylinder Fuel  
90 degree, super premium (1971)
Overhead Valves (OHV) premium gas (1972)
    Intake Manifold  
Displacement 351 cu.inches (CID) aluminum (1971)
Maximum torque   cast iron (1972)
370 lbs./ft. @ 4,000 RPM Valve train solid & adjustable lifters
-1971 Intake 2.184"-2.195""
275 lbs./ft. @ 6,000 RPM Exhaust 1.7045"-1.7145"
-1972 Distributor dual point
  vacuum advance
Maximum Horsepower 330 BHP @ 5,400 RPM Point Gap  
  -1971 Initial Ignition Timing  
  275 BHP @ 6,000 RPM Dwell @ idle RPM  
  -1972
    Spark Plugs Autolite ARF-42
Firing Order 1-3-7-2-6-5-4-8 Spark Plug Gap  
(Number 1 cylinder on right bank, nearest radiator) Long Block Weight 530
    in lbs.
Bore & Stroke 4.002" x 3.50" Emission Controls  
(101.6 mm X 88.9 mm) NOx
Compression Ratio   California
11.5:1 (1971)  
9.2:1 (1972)  
Oil Pressure (hot) 35 to 60 lbf/in2  
Mains 4-bolt RPM Rev Limiter 6,050-6,150 RPM
Carburetor  
Autolite 4300-D (4V)
Squarebore
automatic choke

1970 - The 351 engine was used in Mercury Cougars & Montegos as well as the Ford Mustangs and Torinos.

1970 1/2 - The Ford Falcons had an optional 351 engine.

1971 - The 351 was available for use in the Mercury Cougars & Montegos and the Ford Mustangs and Torinos.

1971-1973 - The HO (High Output) Boss 351 engine was used only in Mustangs. Introduced in December 1970 and was available until the model year 1972. The 1972 Mustang Boss 351's also had ram air.


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