Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine DIY maintenance and service manual

General Information

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp is an 260.9 in³ (4.28 L) internal combustion reciprocating Inline 6 engine. It has bore/stroke ratio of 3.75 in × 3.9375 in (9.52 cm × 10.0012 cm), and uses 8.0:1 compression. This engine was rated 130 hp (96.94 kW) at 3800 rpm and 218 lbf⋅ft (295.57 N⋅m) of torque at 2000 rpm. It was used in Chevrolet and GMC cars.

This engine also known under the name „Chevrolet straight-6 generation II“ and „Jobmaster“.

Engine Performance Rating

SAE J1995 (SAE Gross)

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine performance rating according to SAE J1995 (SAE Gross) standard.
Parameter	Output
Power Rating	150 hp (111.85 kW) at 4000 RPM
Torque Rating	318.62 N⋅m235 lbf⋅ft235 lbf⋅ft at 2000 RPM

SAE J1349 (SAE Net)

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	130 hp (96.94 kW) at 3800 RPM
Torque Rating	295.57 N⋅m218 lbf⋅ft218 lbf⋅ft at 2000 RPM

Specifications

General

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Gasoline
Cylinder Configuration	Inline 6
Engine Displacement	4.28 L260.9 in³260.9 in³
Bore	9.52 cm3.75 in3.75 in
Stroke	10.0012 cm3.9375 in3.9375 in
Compression Ratio	8.0:1
Firing Order	1-5-3-6-2-4
Curb Weight	283.95 kg626 lb626 lb
Curb Idle Speed	450-475 RPMs

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Block, crankshaft and pistons

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine block, crankshaft and pistons specifications.
Parameter	Value
Block Material	Cast Iron
Crankshaft Material	Forged, high carbon steel
Piston Material	Cast alloy aluminum with steel struts; flat head; cam ground; 3 ring grooves above piston pin
Piston Pin Material	Tubular, hardened chrome-alloy steel
Connecting Rod Material	Forged carbon steel; I-beam section

Compression

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine compression.
Parameter	Value
Compression (standart)	8.85 atm.130 Psi130 Psi

Spark Plugs and Wires

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp spark plugs and wires specifications.
Parameter	Value
Spark Plugs	AC Delco C42-1
Spark Plug Size	0.55 in0.55 in14 mm
Spark Plug Gap	889 μm0.035 in0.035 in

Engine head and valvetrain

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp engine head and valvetrain specifications.
Parameter	Value
Head Material	Cast iron
Valvetrain Type	OHV
Valves per Cylinder	2
Camshaft Material	Cast alloy iron

Air Intake

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp fuel injection specifications.
Parameter	Value
Injection Type	Carburetor
Injection Info	Downdraft Rochester with manual choke control

Valve Timings

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp valve timings.
Parameter	Value
Intake Opens	11.5° B.T.D.C.
Intake Closes	52.5° A.B.D.C.
Intake Duration	244°
Exhaust Opens	51° B.B.D.C.
Exhaust Closes	13° A.T.D.C.
Exhaust Duration	244°
Valves Overlap	128°
Ignition Timing	5° B.T.C.

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp valve timing diagram.

Oil Pump

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 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 2400 RPM
Oil Pump Capacity	15.52 lpm3.41 UK gpm4.1 US gpm at 2400 RPM

Water Pump

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 261 CID (4.3 L) Jobmaster 130 hp water pump specifications.
Parameter	Value
Water Pump	Centrifugal type driven by fan belt
Water Pump Capacity	208.18 lpm45.79 UK gpm55 US gpm at 4000 RPM