Engine Summary
- Manufacturer
- Mercury
- Family
- Ford FE-series big-block
- Displacement
- 427 cubic inches
Also Known As
Cougar 427E V-8GT-E W-code 427GT-E 427 side-oilerGT-E R-code 428 Cobra JetGT-E 428 Cobra Jet Ram Air
Engine profile
1968 Cougar GT-E 427/428 FE V8 range
Ford FE-series big-block · 427 cubic inches · Mercury
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
Bright engine dress-up
- Value
- Chrome rocker covers, oil cap, dipstick, radiator cap, and air-cleaner housing
- Application
- GT-E package
- Type
- air cleaner / specification
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar GT-E production , 7.0 Litre GT-E registry overview
427-4V automatic carburetor
- Value
- Holley C8OF-AB, one four-barrel
- Application
- W-code GT-E with C6 automatic; the AMA also lists a generic 427 manual row, but the GT-E registry records no 427 four-speed cars
- Type
- carburetor / engineering number
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar AMA specifications , 1968 Mercury Cougar GT-E production
428-4V carburetors by transmission
- Value
- Holley C8OF-AA with manual transmission; Holley C8OF-AB with automatic transmission; one four-barrel
- Application
- R-code GT-E; registry records three four-speeds and 34 C6 automatics
- Type
- carburetor / engineering number
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar AMA specifications , 1968 Mercury Cougar GT-E production
427-4V factory AMA specification
- Value
- 90-degree OHV V8; 4.23 x 3.78-inch bore and stroke; 10.9:1 compression; cast-iron block and heads; 390 gross hp at 5,600 rpm and 460 lb-ft at 3,200 rpm
- Application
- W-code GT-E engine; premium fuel; all 357 registry-recorded GT-Es used the C6 automatic
- Type
- engine assembly / specification
- Car pages
- 1968 Mercury Cougar GT-E
428-4V factory AMA specification
- Value
- 90-degree OHV V8; the revised AMA prints 4.18 x 3.98-inch bore and stroke while the factory-derived fact sheet reports 4.13 x 3.98; 10.66:1 compression; cast-iron block and heads; 335 gross hp at 5,400 rpm and 440 lb-ft at 3,400 rpm
- Application
- R-code Cobra Jet GT-E; premium fuel; the bore conflict and the AMA's 335-hp rating versus the 340-hp GT-E package record remain explicit
- Type
- engine assembly / specification
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar AMA specifications , 1968 Mercury Cougar fact sheet
R-code 428 Cobra Jet Ram Air
- Value
- 340 gross hp in GT-E package records
- Application
- 37 late GT-Es; 34 C6 and three four-speed
- Type
- engine assembly / specification
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar AMA specifications , 1968 Mercury Cougar GT-E production , 1968 Mercury Cougar sales brochure , 1968 Mercury full-line sales brochure , 7.0 Litre GT-E registry overview
W-code 427 four-barrel
- Value
- 390 gross hp; hydraulic-lifter FE 427
- Application
- 357 GT-Es, all registry-recorded with C6 automatic
- Type
- engine assembly / specification
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar AMA specifications , 1968 Mercury Cougar GT-E production , 1968 Mercury Cougar sales brochure , 1968 Mercury full-line sales brochure , 7.0 Litre GT-E registry overview
427/428 fuel system
- Value
- Mechanical pump on the left side of the engine; 4.5-6.5 psi; automatic choke; hot-and-cold air-cleaner system with dry replaceable element
- Application
- Factory AMA 427-4V and 428-4V fuel-system columns
- Type
- fuel pump / specification
- Car pages
- 1968 Mercury Cougar GT-E
427/428 lubrication system
- Value
- Rotor oil pump, stationary shrouded sump screen, full-flow replaceable filter, and four-quart refill excluding filter; 427 pressure 45-65 psi at 2,000 rpm and 428 pressure 40-70 psi at 2,000 rpm
- Application
- Factory AMA 427-4V and 428-4V service specifications
- Type
- other / specification
- Car pages
- 1968 Mercury Cougar GT-E
Exhaust
- Value
- Dual exhaust with quad chrome outlet tips
- Application
- GT-E package
- Type
- other / specification
- Car pages
- 1968 Mercury Cougar GT-E
Sources: 1968 Mercury Cougar sales brochure , 7.0 Litre GT-E registry overview
427/428 hydraulic valve train
- Value
- Hydraulic lifters; 270-degree intake and 290-degree exhaust duration; 46-degree overlap; 0.481-inch intake and 0.490-inch exhaust lift at zero lash
- Application
- Factory AMA table shared by the Cougar 427-4V and 428-4V
- Type
- valve train / specification
- Car pages
- 1968 Mercury Cougar GT-E
Cars Using This Engine
1 linked car page.
standard Cougar 65A or XR-7 65B two-door hardtop
1968 Mercury Cougar GT-E
7.0 Litre GT-E on standard Cougar or XR-7