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


Roush Engine 427SR with TW

427SR - The most sought-after ROUSH engine in the stable. Available in two configurations, both with dual plane intake manifolds. If you like torque that feels like a freight train, then the ROUSH 427SR is the engine for you.

Technical Specs

Engine Model: 427SR (With TW Cam)
Horsepower (maximum): 515 hp
Torque (maximum): 535 ft.-lbs.
Displacement: 427 cu. in.
Block: 9.5” deck, Dart 4-bolt main
Crankshaft Type:
Forged 4340 Steel (Internally Balanced)
Bore and Stroke: 4.125” x 4.00”
Connecting Rod Type:
Forged 4340 Steel “H-beam”
Compression Ratio: 10.25:1
Wiseco Forged w/ Plasma Moly Rings & Lightweight Pins
Timing Chain: Double Roller
Camshaft Info:
Roush Proprietary (Moderate)
Lifter Type: Hydraulic Roller
Cylinder Heads: 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
Spark Plugs:
Autolite 3923 (or comparable)

Intake Manifold:
Edelbrock Performer RPM Dual Plane
Fuel System:

Holley 770 CFM Carburetor w/ vacuum secondaries and electric choke
Fuel Requirements:

Premium Unleaded (minimum)
Max. Recommended RPM:
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 (Aluminum Available)
Ford Motorsports Super High Torque (1.6kw) (or equivalent)