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


Roush Engine 342R

342R - When space in the engine compartment is limited but maximum performance is desired the 342R is the answer.

Technical Specs

Engine Model: 342R
Horsepower (maximum): 450 HP est.
Torque (maximum): 420 ft.-lbs.
Displacement: 42 cu. in.
Dart Iron Eagle 4-bolt main Sportsman, 8.2” Deck
Crankshaft Type:
Forged 4340 Steel (Internally Balanced)
Bore and Stroke: 4.00” x 3.400”
Connecting Rod Type:
Forged 4340 Steel “H-beam”
Compression Ratio: 10:1
Wiseco Forged w/ Plasma Moly Rings & Lightweight Pins
Timing Chain: Double Roller
Camshaft Info: Roush Proprietary
Lifter Type: Hydraulic Roller
Cylinder Heads: Aluminum
Water Pump:
Reverse-rotation is standard, standard rotation is available
Combustion Chamber Volume: 61 cc
Valve Sizes: 2.02” Intake 1.60” Exhaust
Rocker Arm Ratio: 1.6:1
Spark Plugs: Autolite 3923 (or comparable)

Intake Manifold: Edelbrock Victor Jr
Fuel System:
Holley 770 CFM Carburetor w/ vacuum secondaries and electric choke
Fuel Requirements:
Premium Unleaded (minimum)
Max. Recommended RPM: 6,250
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. 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, (Balanced to 0 oz.)
Ford Motorsports Super High Torque (1.6kw)(or equivalent)

Roush 342R Dyno