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


Roush Engine 402IR

402IR - The combination of a “Weber Style” 8-Stack Fuel Injection Induction System utilizing Roush Engineered calibration and the proven track record of the 402R will surely turn heads with it’s appearance and performance. The 402IR has all of the attributes of a daily driver with more than enough ponies to tear up the pavement.

Technical Specs

Engine Model: 402IR 8-Stack Fuel Injection
Horsepower (maximum):
500 hp (8 qt. Oil Pan)
Torque (maximum): 500 ft.-lbs.
Displacement: 402 cu. in.
9.5” deck, Ford (Windsor) 9.5” Deck Height 2-bolt main
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: 10:1
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:
“Weber Style” 8-Stack Induction System
Fuel System:
Electronic Fuel Injection utilizing Roush Calibration Dual Sync. Distributor, Electric “High Volume” Fuel Pump, Wide Band 02 Sensor, Intake Temp. Sensor, Engine Coolant Sensor, MAP Sensor, IAC (Idle Air Control), and Ignition Control Box.
Fuel Requirements:
Premium Unleaded (minimum)
Max. Recommended RPM: 6,250
Firing Order: 1-3-7-2-6-5-4-8
31 to 34 degrees @ 4,000 rpm (not to exceed 35)
Oil Pump: 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 (or comparable)
Oil Weight:
10w30 - non synthetic for first 3,000 miles
Steel, 157 tooth, (Balanced to 0 oz.)
Ford Motorsports Super High Torque (1.6kw) (or equivalent)

Roush 402IR Dyno