Engine Summary
- Manufacturer
- Chrysler
- Family
- Chrysler LA small-block
- Displacement
- 318 cubic inches
Also Known As
1972 Rallye 3181973 Rallye 3181974 Rallye 318318 V-8318-cu.-in. V-8318 two-barrel318 2-bblG-code 318G in VIN
Engine profile
Chrysler 318 two-barrel LA V8
Chrysler LA small-block · 318 cubic inches · Chrysler
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
318 block geometry
- Value
- Cast-iron 90-degree OHV V8 block and heads with 3.91-inch bore, 3.31-inch stroke, 4.46-inch bore spacing, and 1-8-4-3-6-5-7-2 firing order
- Application
- 1973 Challenger 318-cu.-in. V8
- Type
- block / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
318 block geometry
- Value
- Cast-iron 90-degree OHV V8 block and heads with 3.91-inch bore, 3.31-inch stroke, 4.46-inch bore spacing, and 1-8-4-3-6-5-7-2 firing order
- Application
- 1974 Challenger 318-cu.-in. V8
- Type
- block / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
318 block geometry
- Value
- High-strength cast-iron OHV V8 block with 3.91-inch bore and 3.31-inch stroke
- Application
- Standard 318-cu.-in. Challenger Rallye engine
- Type
- block / specification
- Car pages
- 1972 Dodge Challenger Rallye
340 block geometry
- Value
- Cast-iron 90-degree OHV V8 block and heads with 4.04-inch bore, 3.31-inch stroke, 4.46-inch bore spacing, and 1-8-4-3-6-5-7-2 firing order
- Application
- 1973 Challenger 340-cu.-in. V8
- Type
- block / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
340 block geometry
- Value
- High-strength cast-iron OHV V8 block with 4.04-inch bore and 3.31-inch stroke
- Application
- Optional 340-cu.-in. four-barrel Challenger Rallye engine
- Type
- block / specification
- Car pages
- 1972 Dodge Challenger Rallye
360 block geometry
- Value
- Cast-iron 90-degree OHV V8 block and heads with 4.00-inch bore, 3.58-inch stroke, 4.46-inch bore spacing, and 1-8-4-3-6-5-7-2 firing order
- Application
- 1974 Challenger 360-cu.-in. V8
- Type
- block / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Camshaft drive
- Value
- Hardenable cast-iron camshaft with integral oil-pump and distributor drive gear; the 318 uses a chain with sintered-iron crank gear and nylon-coated cam sprocket, while the 340 uses a double-roller chain with steel crank gear and cast-iron cam sprocket
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- camshaft / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Camshaft drive
- Value
- Hardenable cast-iron camshaft with integral oil-pump and distributor drive gear, driven by a 68-link chain with a sintered-iron crank sprocket and nylon-coated aluminum cam sprocket
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- camshaft / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
318 automatic-transmission Carter BBD
- Value
- BBD-6317S outside California or BBD-6344S for California, one two-barrel carburetor with 1.44-inch barrel size
- Application
- 1973 Challenger 318 V8 with automatic transmission
- Type
- carburetor / carburetor list
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
318 automatic-transmission Carter BBD
- Value
- BBD-6465S outside California or BBD-6467S for California, one two-barrel carburetor with 1.44-inch barrel size
- Application
- 1974 Challenger 318 V8 with automatic transmission
- Type
- carburetor / carburetor list
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
318 manual-transmission Carter BBD
- Value
- BBD-6316S outside California or BBD-6343S for California, one two-barrel carburetor with 1.44-inch barrel size
- Application
- 1973 Challenger 318 V8 with manual transmission
- Type
- carburetor / carburetor list
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
318 manual-transmission Carter BBD
- Value
- BBD-6464S outside California or BBD-6466S for California, one two-barrel carburetor with 1.44-inch barrel size
- Application
- 1974 Challenger 318 V8 with manual transmission
- Type
- carburetor / carburetor list
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
340 automatic-transmission Carter Thermo-Quad
- Value
- TQ-6319S outside California or TQ-6340S for California, one four-barrel carburetor with 1.38-inch primaries and 2.25-inch secondaries
- Application
- 1973 Challenger 340 V8 with automatic transmission
- Type
- carburetor / carburetor list
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
340 manual-transmission Carter Thermo-Quad
- Value
- TQ-6318S outside California or TQ-6339S for California, one four-barrel carburetor with 1.38-inch primaries and 2.25-inch secondaries
- Application
- 1973 Challenger 340 V8 with manual transmission
- Type
- carburetor / carburetor list
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
360 automatic-transmission Carter Thermo-Quad
- Value
- TQ-6453S outside California or TQ-6455S for California, one four-barrel carburetor with 1.50-inch primaries and 2.25-inch secondaries
- Application
- 1974 Challenger 360 V8 with automatic transmission
- Type
- carburetor / carburetor list
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
360 manual-transmission Carter Thermo-Quad
- Value
- TQ-6452S outside California; the factory sheet does not list a California manual-transmission application; one four-barrel carburetor with 1.50-inch primaries and 2.25-inch secondaries
- Application
- 1974 Challenger 360 V8 with manual transmission
- Type
- carburetor / carburetor list
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Connecting rods and bearings
- Value
- Drop-forged steel 6.123-inch rods; 318 rods weigh 25.6 ounces with bi-metal-grid bearings, while 340 rods weigh 26.7 ounces with tri-metal bearings
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- connecting rod / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Connecting rods and bearings
- Value
- Drop-forged steel 6.123-inch rods; 318 rods weigh 25.6 ounces with aluminum-on-steel bearings, while 360 rods weigh 26.7 ounces with tri-metal bearings
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- connecting rod / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Connecting rods and bearings
- Value
- Drop-forged manganese-steel I-beam rods; 318 bearing size 2.13 x 0.843 inches and 340 bearing size 2.38 x 0.927 inches
- Application
- Factory 318 and 340 V8 specifications
- Type
- connecting rod / specification
- Car pages
- 1972 Dodge Challenger Rallye
Crankshaft and vibration damper
- Value
- Cast-ductile-iron crankshaft with five main bearings, 2.125-inch crankpins, 0.002-0.010-inch end play, and a non-adhesive rubber-tuned dynamic damper
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- crankshaft / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Crankshaft and vibration damper
- Value
- Cast-ductile-iron crankshaft with five main bearings, 2.125-inch crankpins, 0.002-0.010-inch end play, and a non-adhesive rubber-tuned dynamic damper
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- crankshaft / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
318 distributor and initial timing
- Value
- Distributor 3656763; 2.5 degrees BTDC with manual transmission or TDC with automatic at the specified idle speed
- Application
- 1973 Challenger 318 V8
- Type
- distributor / part number
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
318 distributor and initial timing
- Value
- Distributor 3656763 with initial timing at TDC for either transmission at the specified neutral idle speed
- Application
- 1974 Challenger 318 V8
- Type
- distributor / part number
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
340 distributor and initial timing
- Value
- Distributor 3656771; 5 degrees BTDC with manual transmission or 2.5 degrees BTDC with automatic at the specified idle speed
- Application
- 1973 Challenger 340 V8
- Type
- distributor / part number
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
360 distributor and initial timing
- Value
- Distributor 3755486 with initial timing at 5 degrees BTDC for either transmission at the specified neutral idle speed; the manual-transmission distributor application is marked unavailable in California
- Application
- 1974 Challenger 360 V8
- Type
- distributor / part number
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
318 induction and rotating assembly
- Value
- Two-barrel carburetor, single-level intake manifold, cast-iron crankshaft, hydraulic tappets, and single exhaust
- Application
- Standard 318-cu.-in. Challenger Rallye engine
- Type
- engine assembly / specification
- Car pages
- 1972 Dodge Challenger Rallye
318 two-barrel LA V8
- Value
- 150 SAE net hp at 3,600 rpm; 265 lb-ft at 2,000 rpm; 8.6:1 compression; single exhaust
- Application
- standard Challenger engine with or without A57
- Type
- engine assembly / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications , 1973 Dodge Dealership Data Book - Challenger
318 two-barrel LA V8
- Value
- 150 SAE net hp at 4,000 rpm; 255 lb-ft at 2,200 rpm; 8.6:1 compression; single exhaust
- Application
- standard Challenger engine with or without A57
- Type
- engine assembly / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications , 1974 Dodge Dealership Data Book - Challenger
318 two-barrel LA V8
- Value
- 150 SAE net hp; 8.6:1 compression; single exhaust
- Application
- standard Rallye engine
- Type
- engine assembly / specification
- Car pages
- 1972 Dodge Challenger Rallye
Sources: 1972 Dodge Challenger Specifications and Production , 1972 Dodge Dealership Data Book - Challenger
340 four-barrel LA V8
- Value
- 240 SAE net hp at 4,800 rpm; 295 lb-ft at 3,600 rpm; 8.5:1 compression; dual exhaust
- Application
- optional Challenger engine with or without A57
- Type
- engine assembly / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications , 1973 Dodge Dealership Data Book - Challenger
340 four-barrel LA V8
- Value
- 240 SAE net hp; 8.5:1 compression; dual exhaust; electronic ignition
- Application
- optional Rallye engine
- Type
- engine assembly / specification
- Car pages
- 1972 Dodge Challenger Rallye
Sources: 1972 Dodge Challenger Specifications and Production , 1972 Dodge Dealership Data Book - Challenger , 1972 Dodge Dealership Data Book - Challenger Errata
340 performance construction
- Value
- Forged crankshaft, double-roller timing chain and sprockets, four-barrel carburetor, special camshaft, unsilenced air cleaner, and dual exhaust
- Application
- Optional 340-cu.-in. four-barrel Challenger Rallye engine
- Type
- engine assembly / specification
- Car pages
- 1972 Dodge Challenger Rallye
360 four-barrel LA V8
- Value
- 245 SAE net hp at 4,800 rpm; 320 lb-ft at 3,600 rpm; 8.4:1 compression; dual exhaust
- Application
- optional Challenger engine with or without A57
- Type
- engine assembly / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications , 1974 Dodge Dealership Data Book - Challenger
Factory exhaust systems
- Value
- The 318 uses single exhaust with crossover and one reverse-flow muffler; the 340 uses dual exhaust with two resonators and two reverse-flow mufflers
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- exhaust manifold / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Factory exhaust systems
- Value
- The 318 uses single exhaust with crossover and one reverse-flow muffler; the 360 uses dual exhaust with two resonators and two reverse-flow mufflers
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- exhaust manifold / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Fuel delivery and idle settings
- Value
- Mechanical right-front fuel pump at 6-7.5 psi with paper supply-line filter; manual idle is 750 rpm for the 318 and 850 rpm for the 340, while automatic idle is 700 and 850 rpm respectively
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- fuel pump / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Fuel delivery and idle settings
- Value
- Mechanical right-front fuel pump at 5-7 psi with a plastic in-tank filter and paper supply-line filter; neutral idle is 750 rpm for the 318 and 850 rpm for the 360 with either transmission
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- fuel pump / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
N23 electronic ignition
- Value
- Standard with the 340 V8 package and optional with the 318 V8
- Application
- Corrected Challenger application from the factory errata sheet
- Type
- ignition / other
- Car pages
- 1972 Dodge Challenger Rallye
Sources: 1972 Dodge Dealership Data Book - Challenger , 1972 Dodge Dealership Data Book - Challenger Errata
Standard electronic ignition
- Value
- Transistorized ignition was standard; the 318 used Champion N-13Y plugs and the 340 used N-12Y plugs, both gapped at 0.035 inch
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- ignition / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Standard electronic ignition
- Value
- Transistorized ignition was standard; the 318 used Champion N-13Y plugs and the 360 used N-12Y plugs, both gapped at 0.035 inch
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- ignition / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Cooling-system capacity
- Value
- 16 quarts for the 318 V8 and 15 quarts for the 340 V8, including heater; add one quart with air conditioning
- Application
- 16-psi pressure-vent-cap cooling systems
- Type
- other / specification
- Car pages
- 1972 Dodge Challenger Rallye
Cooling-system capacity
- Value
- Pressure-vented 16-psi system; 16 quarts with heater for the 318 and 15 quarts for the 340, increasing to 17.5 and 15.5 quarts respectively with air conditioning
- Application
- 1973 Challenger 318 and 340 V8 specifications revised February 20, 1973
- Type
- other / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Cooling-system capacity
- Value
- Pressure-vented 16-psi system with a 195-degree thermostat and 16-quart capacity with heater; air-conditioning equipment increases capacity to 17.5 quarts for the 318 while the 360 remains 16 quarts
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- other / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Engine filtration
- Value
- Heavy-duty replaceable-element dry air cleaner, full-flow throwaway oil filter, 40-micron tank fuel filter, and 15-micron filter between pump and carburetor
- Application
- Factory 318 and 340 V8 service specification
- Type
- other / specification
- Car pages
- 1972 Dodge Challenger Rallye
Lubrication system
- Value
- Pressure lubrication for main, rod, camshaft, and tappet bearings; metered-jet piston-pin and cylinder-wall lubrication; rotary pump, full-flow filter, 45-65 psi at 2,000 rpm, and 4-quart capacity plus the filter
- Application
- 1973 Challenger 318 and 340 V8 service specification
- Type
- other / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Lubrication system
- Value
- Pressure lubrication for main, rod, camshaft, and tappet bearings; metered-jet piston-pin and cylinder-wall lubrication; rotary pump, full-flow filter, 45-65 psi at 2,000 rpm, and 4-quart capacity plus the filter
- Application
- 1974 Challenger 318 and 360 V8 service specification
- Type
- other / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Lubrication system
- Value
- Positive-pressure regulated and filtered system with rotary positive-displacement pump; 4-quart oil capacity plus one quart when changing the filter
- Application
- Factory 318 and 340 V8 service specification
- Type
- other / specification
- Car pages
- 1972 Dodge Challenger Rallye
318 and 340 piston construction
- Value
- Aluminum-alloy pistons; the 318 uses a closed slipper, steel-strut, elliptically turned, tin-plated design, while the 340 uses an open slipper design
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- piston / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
318 and 360 piston construction
- Value
- Aluminum-alloy closed-slipper pistons with steel struts, elliptical turning, and tin plating; piston-only weight is 20.9 ounces for the 318 and 20.6 ounces for the 360
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- piston / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Hydraulic tappets
- Value
- Hydraulic tappets with chrome-plated plungers
- Application
- Factory 318 and 340 V8 specification
- Type
- valve train / specification
- Car pages
- 1972 Dodge Challenger Rallye
Hydraulic valvetrain and lift
- Value
- Standard hydraulic lifters and 1.5:1 rocker ratio; zero-lash lift is 0.373-inch intake and 0.400-inch exhaust for the 318, and 0.429-inch intake and 0.444-inch exhaust for the 340
- Application
- 1973 Challenger 318 and 340 V8 specifications
- Type
- valve train / specification
- Car pages
- 1973 Dodge Challenger Rallye
Sources: 1973 Automobile Manufacturers Association Challenger Specifications
Hydraulic valvetrain and lift
- Value
- Standard hydraulic lifters and 1.5:1 rocker ratio; zero-lash lift is 0.373-inch intake and 0.400-inch exhaust for the 318, and 0.429-inch intake and 0.444-inch exhaust for the 360
- Application
- 1974 Challenger 318 and 360 V8 specifications
- Type
- valve train / specification
- Car pages
- 1974 Dodge Challenger Rallye
Sources: 1974 Automobile Manufacturers Association Challenger Specifications
Cars Using This Engine
3 linked car pages.
JS23 two-door hardtop
1972 Dodge Challenger Rallye
Standard 318 two-barrel or optional 340 four-barrel V8
JH23 two-door hardtop with A57 Rallye Package
1973 Dodge Challenger Rallye
Standard 318 two-barrel or optional 340 four-barrel V8
JH23 two-door hardtop with A57 Rallye Package
1974 Dodge Challenger Rallye
Standard 318 two-barrel or optional 360 four-barrel V8