Roush 427R Engine

ROUSH 427R DECK DART ENGINE

427R – This is our thoroughbred and has a single plane intake manifold and a “double pumper” carburetor. Maximum horsepower, maximum fun.

Technical Specs

Engine Model: 427R
Horsepower (Maximum): 550 hp (with Victor Jr. Intake & 8qt. Oil Pan)
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
Pistons: 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: Single or Dual Plane Available
Fuel System: Holley 750 CFM Carburetor w/ Mechanical Secondaries (Electric Choke Available)
Fuel Requirements: Premium Unleaded (Minimum)
Max. Recommended RPM: 6,250
Firing Order: 1-3-7-2-6-5-4-8
Timing: 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
Flywheel: Steel, 157 Tooth (Aluminum Available)
Starter: Ford Motorsports Super High Torque (1.6kw)(Or Equivalent)