Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine DIY maintenance and service manual

General Information

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp is an 348 in³ (5.7 L) internal combustion reciprocating V8 engine. It has bore/stroke ratio of 4.125 in × 3.25 in (10.478 cm × 8.26 cm), and uses 7.75:1 compression. This engine was rated 194 hp (144.67 kW) at 3800 rpm and 302 lbf⋅ft (409.46 N⋅m) of torque at 2600 rpm. It was used in Chevrolet and GMC cars.

Truck version.

Equipped with 4 barrel carburetor.

Forged Crank: round flywheel bolt flange

Connecting rod length: 6.135 inches

Crankshaft mains: 2.4977 inches

Push rod length: exhaust 9.140 inches, intake 8.772 inches

Push rod diameter: 5/16 inch (all)

Fuel pump push rod length: 5.75 inches

Dipstick: on drivers side

Rocker arm ration: 1.75:1

Engine Performance Rating

SAE J1995 (SAE Gross)

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine performance rating according to SAE J1995 (SAE Gross) standard.
Parameter	Output
Power Rating	230 hp (171.51 kW) at 4400 RPM
Torque Rating	454.2 N⋅m335 lbf⋅ft335 lbf⋅ft at 2800 RPM

SAE J1349 (SAE Net)

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	194 hp (144.67 kW) at 3800 RPM
Torque Rating	409.46 N⋅m302 lbf⋅ft302 lbf⋅ft at 2600 RPM

Specifications

General

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Gasoline
Cylinder Configuration	V8
Engine Displacement	5.7 L348 in³348 in³
Bore	10.478 cm4.125 in4.125 in
Stroke	8.26 cm3.25 in3.25 in
Compression Ratio	7.75:1
Firing Order	1-8-4-3-6-5-7-2
Curb Weight	367.41 kg810 lb810 lb
Curb Idle Speed	450-475 RPMs

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Block, crankshaft and pistons

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine block, crankshaft and pistons specifications.
Parameter	Value
Block Material	Cast alloy iron
Crankshaft Material	Forged steel, induction hardened journalls
Piston Material	Cast alloy aluminum with steel struts; peaked head
Piston Pin Material	Chromium steel
Connecting Rod Material	Forged steel

Spark Plugs and Wires

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp spark plugs and wires specifications.
Parameter	Value
Spark Plugs	AC Delco C42N (long reach)
Spark Plug Size	0.55 in0.55 in14 mm
Spark Plug Gap	889 μm0.035 in0.035 in

Engine head and valvetrain

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp engine head and valvetrain specifications.
Parameter	Value
Head Material	Cast alloy iron
Valvetrain Type	OHV
Valves per Cylinder	2
Camshaft Material	Cast alloy iron

Air Intake

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp fuel injection specifications.
Parameter	Value
Injection Type	Carburetor
Injection Info	4-barrel Rochester downdraft type with manual choke control

Valve Timings

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp valve timings.
Parameter	Value
Intake Opens	18.5° B.T.D.C.
Intake Closes	67.5° A.B.D.C.
Intake Duration	266°
Exhaust Opens	68.5° B.B.D.C.
Exhaust Closes	25.5° A.T.D.C.
Exhaust Duration	274°
Valves Overlap	180°
Ignition Timing	4° B.T.C.

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp valve timing diagram.

Oil Pump

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp oil pump specifications.
Parameter	Value
Oil Pump	Spur-gear type driven by distributor shaft
Oil Pump Pressure	2.04 atm.30 Psi30 Psi at 1200 RPM
Oil Pump Capacity	15.97 lpm3.51 UK gpm4.22 US gpm at 1200 RPM

Water Pump

Chevrolet gasoline Big-block W-series (Mark I) 348 CID (5.7 L) Workmaster 194 hp water pump specifications.
Parameter	Value
Water Pump	Centrifugal type driven by fan belt
Water Pump Capacity	306.58 lpm67.44 UK gpm81 US gpm at 4000 RPM