V-392 four-barrel
late 1960s–1980s family era235.6 hp max / 185 hp net factory industrial rating
Largest core SV-family V8
International Harvester V-392 SV V8 enginePhoto: CZmarlin (Christopher Ziemnowicz) · CC BY-SA 4.0
International Harvester · SV V8
International Harvester V-392 SV V8
The largest common SV-family V8, combining a 4.125-inch bore with the 345's long stroke.
392
Cubic inches
The 392 maximized the regular SV family by combining its largest bore with the long-stroke crank, giving heavy International pickups, Travelalls and medium trucks the strongest displacement option in the family. It was never factory-installed in the Scout.
Key variants
All variantsV-392 four-barrel1974 392 light-truck
Displacement
392 ci
Bore
4.125"
Stroke
3.65625"
Years
1960s–1980s family era
Key Takeaway
The 392 maximized the common SV family with a 4.125-inch bore and 3.65625-inch stroke. Its deep-skirt cast-iron construction, large displacement, and low-rpm tuning made it a heavy-duty torque engine rather than a high-speed performance design.
Technical Specifications
- Compression
- 8.0:1 in International Harvester carbureted-engine factory specification
- Horsepower
- 235.6 hp @ 4000 rpm maximum; 185 hp @ 3600 rpm net in factory industrial specification; 1974 light-truck calibration 179 hp net or 193 hp with dual exhaust
- Torque
- 356.5 lb-ft @ 2800 rpm maximum; 303 lb-ft @ 2800 rpm net in factory specification
- Architecture
- 90-degree OHV SV-series V8
- Block
- Cast iron deep-skirt truck block
- Cylinder heads
- Cast iron
- Valvetrain
- Pushrod OHV
- Aspiration
- Naturally aspirated
- Fuel delivery
- Carbureted
- Firing order
- 1-8-4-3-6-5-7-2
The 392 maximized the common SV family with a 4.125-inch bore and 3.65625-inch stroke. Its deep-skirt cast-iron construction, large displacement, and low-rpm tuning made it a heavy-duty torque engine rather than a high-speed performance design.
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.
Identification & Output
- Engine codes / RPO
- V-392 / C-392 / 392 SV
- Casting numbers
- Use the IH engine-ID pad/serial plus 4.125 x 3.656-inch bore/stroke; no single casting number is retained as universal proof of every 392 application.
- Power rating
- Factory manual lists both maximum brake horsepower and net brake horsepower; vehicle brochures use SAE net in the 1970s
- Horsepower RPM
- 235.6 hp @ 4000 rpm maximum; 185 hp @ 3600 rpm net; 1974 Travelall 179 hp net / 193 hp dual exhaust
- Torque RPM
- 356.5 lb-ft @ 2800 rpm maximum; 303 lb-ft @ 2800 rpm net
Operating Specs
- Production notes
- The 392 uses the 345’s 3.656-inch stroke with a larger 4.125-inch bore. It became the top regular SV-family displacement in Light Line and medium-duty applications.
Compatibility Notes
- Do not confuse the IH 392 with Chrysler’s 392 Hemi; they are unrelated engine families.
- Cooling passages, mounts, oil pans and accessory drives vary by application, and some later 392 service/replacement configurations differ from early Light Line engines.
Notable Applications
International pickupsInternational TravelallInternational Loadstar and other medium-duty trucks
Strengths
- Largest common SV displacement
- Strong low-rpm torque
- Very durable bottom end
Weaknesses / Watch-outs
- Heavy and physically bulky
- Cooling system must be healthy
- Low-rpm breathing limits high-speed power
Common Upgrades
- Four-barrel carburetion
- Electronic ignition
- Headers and dual exhaust
- Cooling-system upgrades
Racing History & Legacy
The 392 was developed as a large gasoline truck engine, not a dedicated competition unit. Its large displacement made it a favored IH performance and towing engine in later Scout/Light Line enthusiast builds.
The 392 became the enthusiast favorite for maximum SV-family displacement. It is especially notable because, despite later swap popularity, it was not a factory Scout engine.
References & Image Credit
Engine image: CZmarlin (Christopher Ziemnowicz) · CC BY-SA 4.0 · source
IH SV engine service manual
service reference
International Harvester operator manual — C392 service and operating data
manufacturer service manual
1974 International Travelall brochure — 392 net horsepower and dual-exhaust ratings
manufacturer brochure
International Harvester carbureted-engine operator manual — C304/C345/C392 specifications
manufacturer service manual
1974 International Travelall factory brochure — V304/V345/V392 net ratings
manufacturer brochure
Key Factory / Build Variants
1974 392 light-truck
1974179 hp net; 193 hp with dual exhaust
Travelall/Light Line emissions-era specification
Engineering Notes Worth Knowing
01
4.125 x 3.65625-inch bore and stroke; 392 cu in / 6.4 L.
02
Largest common-displacement member of International's SV V8 family.
03
Factory specifications vary by application, with documented maximum output above 230 hp gross and torque above 350 lb-ft.
04
Used in International pickups, Travelall, Loadstar, and other medium-duty applications.
History · context · related reading
The Story Behind International Harvester V-392 SV V8
The 392 was International’s big-cube answer for heavier light trucks and medium-duty vehicles. Rather than chase horsepower per cubic inch, it delivered displacement, durability, and low-speed torque in the tradition of the rest of the SV family.
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