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


Roush Engine 353IR

353IR - As the flagship of the ROUSH 5.0 Liter engines it only makes sense that ROUSH’s exclusive 8-stack induction system was utilized. Though it might look like a “Weber,” this fuel-injected system includes the ROUSH-engineered calibration and exclusive intake manifold design.

Technical Specs

Engine Model: 353R Single 4V Carburetor
Horsepower (maximum):
475 HP Est. (w/ Front Sump Pan)
Torque (maximum): 450 Lbs./Ft. Est.
Displacement: 353 cu. in.
Dart 4-bolt Iron Eagle, 8.2” deck, 4-bolt main #’s 2,3, & 4
Crankshaft Type:
Eagle Forged 4340 Steel (Internally Balanced)
Bore and Stroke: 4.150” x 3.250”
Connecting Rod Type:
Eagle Forged 4340 Steel “H-beam”
Compression Ratio: 10.00:1
Wiseco Forged w/ Plasma Moly Rings & Lightweight Pins
Timing Chain: Double Roller
Camshaft Info: Roush Proprietary
Lifter Type: Hydraulic Roller
Cylinder Heads: Roush/AFR Aluminum
Intake Runner Volume:
205 cc, fully CNC ported
Combustion Chamber Volume: 61 cc
Valve Sizes: 2.08” Intake 1.600” Exhaust

Rocker Arm Ratio:
1.6:1/Full Roller, Extruded Aluminum Body
Spark Plugs: Autolite 3923 (or comparable)
Intake Manifold: Edelbrock Victor Jr. Single Plane
Fuel System:
Fuel Requirements:
Premium Unleaded (minimum)
Max. Recommended RPM: 6,250
Firing Order: 1-3-7-2-6-5-4-8
Timing: 30 to 34 degrees @ 4,000 rpm
Oil Pump:
Melling High Volume - Adjustable
Oil Pan:
Canton Racing 8 qt. Fully Baffled Front Sump Road Race-Powdercoated
Oil Filter:
Motorcraft FL-1HP (or comparable)
Oil Weight:
10w30 - non synthetic for first 3,000 miles
McLeod SFI Rated Steel, 157 Tooth Ring Gear
Powermaster High Torque Gear Reduction (or equivalent)

Roush 353IR Dyno