Jeep · Kaiser Tornado
Jeep 230 Tornado OHC Six
The advanced single-overhead-cam six used in early Wagoneers, Gladiators and military M715s.
230
Cubic inches
The Tornado used a chain-driven overhead cam years before OHC layouts became mainstream in American trucks.
Displacement
230 ci
Bore
3.34"
Stroke
4.38"
Years
1962–1965 civilian Jeep era; 1967–1969 M715-family military use
Key Takeaway
The Tornado 230 used a chain-driven single overhead cam, aluminum cylinder head, and a very long 4.38-inch stroke. Its OHC layout was unusually advanced for an American truck engine of the early 1960s and allowed better breathing than Jeep’s older flathead designs.
Technical Specifications
- Compression
- 8.5:1 high-compression; 7.5:1 low-compression
- Horsepower
- 140 hp @ 4000 rpm high-compression specification
- Torque
- 210 lb-ft @ 1700 rpm
- Architecture
- SOHC inline six
- Block
- Cast iron
- Cylinder heads
- Aluminum
- Valvetrain
- Single overhead cam
- Aspiration
- Naturally aspirated
- Fuel delivery
- One- or two-barrel carburetion
- Main bearings
- 4
The Tornado 230 used a chain-driven single overhead cam, aluminum cylinder head, and a very long 4.38-inch stroke. Its OHC layout was unusually advanced for an American truck engine of the early 1960s and allowed better breathing than Jeep’s older flathead designs.
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.
Notable Applications
Strengths
- SOHC breathing
- Strong low-speed torque
- Historically advanced design
Weaknesses / Watch-outs
- Timing and oiling service reputation
- Specialist parts market
- Long-stroke geometry
Common Upgrades
- Careful cam/oiling-system restoration
- Electronic ignition
- Carburetor tuning
Racing History & Legacy
The 230 Tornado stands out as one of Jeep’s most technically ambitious early engines. Its OHC design anticipated a direction that would become common decades later, even though its civilian production window was short.
References & Image Credit
Engine image: Christopher Ziemnowicz (CZmarlin) · CC0 1.0 · source
Engineering Notes Worth Knowing
3.34 x 4.38-inch bore and stroke; 230 cu in / 3.8 L.
SOHC inline-six with aluminum cylinder head and cast-iron block.
High-compression form rated at 140 hp at 4,000 rpm and 210 lb-ft at 1,700 rpm.
Used in Wagoneer, Gladiator, Willys utility vehicles, and later M715-family military trucks.
History · context · related reading
The Story Behind Jeep 230 Tornado OHC Six
The Tornado arrived when overhead-cam truck engines were still rare in the United States. Jeep adopted the design as a modern replacement for older flathead sixes, pairing advanced valvegear with the low-speed torque expected from utility and four-wheel-drive vehicles.
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