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Title Shelby cars north west, factory authorized dealer for shelby automobiles


Roush Engine 402R

402R - This is the wild version of the 402. ROUSH engineers have stuffed in a more aggressive cam shaft and single plane intake. It’s combination of internally balanced forged rotating assembly (crank, rods, and pistons) and the magic of a 4-inch stroke, delivers smooth power from idle to red line.

Technical Specs

Engine Model: 402R
Horsepower (maximum):
515 hp (with Victor Jr. intake & 8 qt. Oil Pan)
Torque (maximum): 500 ft.-lbs.
Displacement: 402 cu. in.
Dart Iron Eagle 4-bolt main Sportsman, 9.5” Deck
Crankshaft Type:
Forged 4340 Steel (Internally Balanced)
Bore and Stroke: 4.00” x 4.00”
Connecting Rod Type:
Forged 4340 Steel “H-beam”
Compression Ratio: 10.0:1
Wiseco Forged w/ Plasma Moly Rings & Lightweight Pins
Timing Chain: Double Roller
Camshaft Info: Roush Proprietary
Lifter Type: Hydraulic Roller
Cylinder Heads: Aluminum
Intake Runner Volume:
185 cc, fully CNC ported
Combustion Chamber Volume: 61 cc
Valve Sizes: 2.02” Intake 1.60” Exhaust
Rocker Arm Ratio: 1.6:1
Spark Plugs: Autolite 3923 (or comparable)

Intake Manifold:
Single or Dual Plane available
Fuel System:
Holley 770 CFM Carburetor w/ vacuum secondaries and electric choke
Fuel Requirements:
Premium Unleaded (minimum)
Max. Recommended RPM: 6,250
Firing Order: 1-3-7-2-6-5-4-8
29 to 33 degrees @ 4,000 rpm (not to exceed 33)
Oil Pump: Melling High Output - Adjustable
Oil Pan:
Powder Coated 8 qt. Front Sump - Baffled or Dual-sump (Mustang) available *horsepower output can be reduced when engine is equipped with the Dual-sump pan
Oil Filter:
Motorcraft FL1-HP (or comparable)
Oil Weight:
10w30 - non synthetic for first 3,000 miles
Steel, 157 tooth, (Balanced to 0 oz.)
Powermaster Super High Torque (1.6kw)(or equivalent)

Roush 402R Dyno