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


Roush Engine 427RX

In the history of Hot Rods and Muscle Cars, the number 427 brings back plenty of “Magic Memories”. Back then, the “Side Oiler” was the king. Today, we have the option to build to this memorable cubic inch and still have all of the benefits of the “Windsor Engine”.

Technical Specs

Engine Model: 427RX
Horsepower (maximum): 675 hp
Torque (maximum): 560 lbs./ft.
Displacement: 427 cu. in.
Dart Iron Eagle, 9.5” deck, 4-bolt main caps
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: 13.5:1
Pistons: Forged Aluminum
Timing Chain: Multi-Index w/ HY-VO Chain
Camshaft Info: Roush Proprietary
Lifter Type: Solid Roller
Cylinder Heads: Aluminum
Intake Runner Volume:
225 cc, fully CNC ported
Combustion Chamber Volume: 61 ccValve
Sizes: 2.08” Intake 1.600” Exhaust

Rocker Arm Ratio: 1.6:1 Adjustable Roller
Spark Plugs: Autolite 3923 (or comparable)
Intake Manifold:
Edelbrock Victor Single Plane
Fuel System:
Holley HP 1000 CFM Carburetor w/ mechanical secondaries
Fuel Requirements: 110 Octane
Max. Recommended RPM: 7,500
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:
8 qt. Wet Sump (several styles available)
Oil Filter:
Motorcraft FL-1HP (or comparable)
Oil Weight: 10w30 Mobil1 Synthetic
Flywheel/Flexplate: Available
Starter: Available