ROUSH 427IR DECK DART ENGINE

427IR - This engine gets 50 more horsepower and an additional 35 lb.-ft. of torque than the 402IR, but has the same combination of a “Weber Style” 8-Stack Fuel Injection Induction System utilizing Roush Engineered calibration.

Technical Specs

Engine Model: 427IR 8-Stack Fuel Injection Horsepower (maximum): 560 hp (8 qt. Oil Pan) Torque (maximum): 540 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 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/Full Roller, Extruded Aluminum Body 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 Timing: 31 to 34 degrees @ 4,000 rpm (not to exceed 35) Oil Pump: High Volume - 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 FL-1HP (or comparable) Oil Weight: 10w30 - non synthetic for first 3,000 miles Flywheel: SFI Rated Steel, 157 Tooth Ring Gear Starter: Powermaster High Torque Gear Reduction (or equivalent)