AMC · Gen I Rambler V8
AMC 327 V8 / Vigilante
The big-bore Gen I AMC V8 used in fast Ramblers and later Jeep Wagoneers and trucks.
327
Cubic inches
AMC's 327 predated Chevrolet's 327 and gave the 1957 Rambler Rebel one of the best power-to-weight combinations of its era. Jeep later sold it as the Vigilante V8.
Displacement
327 ci
Bore
4"
Stroke
3.25"
Years
1957–1967 AMC/Rambler era; Jeep use into early 1968
Key Takeaway
The Gen I 327 combined a 4.00-inch bore with the family's 3.25-inch stroke. Its cast-iron OHV architecture, forged rotating hardware, and relatively large bore gave AMC a strong performance engine before Chevrolet introduced an unrelated 327 of its own.
Technical Specifications
- Horsepower
- Varies by year/application; see documented variants
- Torque
- 345 lb-ft in 1957 Rambler Rebel specification; 340 lb-ft @ 2600 rpm in 1965 Jeep Vigilante 327 specification
- Architecture
- 90-degree OHV V8
- Block
- Cast iron
- Cylinder heads
- Cast iron
- Valvetrain
- Pushrod OHV; hydraulic lifters in 327 production architecture
- Aspiration
- Naturally aspirated
- Fuel delivery
- Carbureted
The Gen I 327 combined a 4.00-inch bore with the family's 3.25-inch stroke. Its cast-iron OHV architecture, forged rotating hardware, and relatively large bore gave AMC a strong performance engine before Chevrolet introduced an unrelated 327 of its own.
Internal Specifications
Variant-specific values are labeled. Engine families that span multiple years or RPOs can have different heads, cams, induction and rotating parts, so the exact code/year always takes priority.
Rotating Assembly
- Crankshaft
- Forged steel
- Connecting rods
- Forged steel
Notable Applications
Strengths
- Forged rotating assembly
- Large 4.00-inch bore
- Important early performance and Jeep history
Weaknesses / Watch-outs
- Heavy Gen I tall-deck design
- Parts do not interchange broadly with later Gen II/III AMC V8s
Common Upgrades
- Four-barrel intake
- Dual exhaust
- Modern ignition
Racing History & Legacy
The 327 connected AMC's first performance cars to Jeep's early V8-powered utility vehicles.
References & Image Credit
Engine image: Christopher Ziemnowicz · Public domain · source
Engineering Notes Worth Knowing
327 cu in / 5.4 L with 4.00 x 3.25-inch bore and stroke.
Cast-iron 90-degree OHV V8 with hydraulic-lifter production architecture.
Naturally aspirated and carbureted.
Used in Rambler performance cars and later Jeep Wagoneer/Gladiator applications.
History · context · related reading
The Story Behind AMC 327 V8 / Vigilante
The AMC 327 is easy to misidentify because of its displacement, but it was a completely separate design that arrived before Chevrolet's 327. It powered early AMC performance cars and later became Jeep's Vigilante V8.
TorqueList Garage Reference Series
See this engine inside the full AMC reference catalog.
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