Early Nash 195.6 L-head
1952–195590 hp class; compression about 7.3–7.45:1
Longest-stroke evolution of the original Nash flathead family
Nash 195.6 L-Head Six enginePhoto: CZmarlin (Christopher Ziemnowicz) · CC BY 4.0
Nash · Rambler Flathead Six
Nash 195.6 L-Head Six
The final large-displacement evolution of Nash's compact flathead-six family.
195.6
Cubic inches
The 195.6 stretched the original Nash flathead-six architecture to its largest displacement before the family was converted to overhead valves for 1956.
Key variants
All variantsEarly Nash 195.6 L-headRambler American 195.6 L-head
Displacement
195.6 ci
Bore
3.125"
Stroke
4.25"
Years
1952–1955 Nash era; reintroduced 1958–1965 under AMC/Rambler
Key Takeaway
The 195.6 stretched Nash's original small-six family again, retaining the 3.125-inch bore and extending stroke to 4.25 inches. The long-stroke flathead delivered dependable low-rpm torque but had reached the airflow limits of side-valve architecture.
Technical Specifications
- Compression
- 7.3–7.45:1 in early 1952–1955 Nash applications; 8.0:1 in the 1958–1965 Rambler American reintroduction
- Horsepower
- 90 hp @ 3800 rpm in representative 1953 and 1958 specifications
- Torque
- 150 lb-ft @ 1600 rpm in representative 1958 Rambler American specification
- Architecture
- L-head inline six
- Block
- Cast iron
- Cylinder heads
- Cast iron
- Valvetrain
- Side-valve L-head
- Aspiration
- Naturally aspirated
- Fuel delivery
- Carbureted
- Firing order
- 1-5-3-6-2-4
The 195.6 stretched Nash's original small-six family again, retaining the 3.125-inch bore and extending stroke to 4.25 inches. The long-stroke flathead delivered dependable low-rpm torque but had reached the airflow limits of side-valve architecture.
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
- 195.6 L-head / flathead six; pre-1960 engines use year-specific serial prefixes rather than one universal RPO-style code
- Casting numbers
- No single casting number safely identifies every 1952–1965 195.6 L-head. Verify bore/stroke, serial/date, head chamber and water-pump arrangement; the 1958 reintroduction moved the water pump to the front.
- Power rating
- Period brake horsepower / SAE gross-era rating
- Horsepower RPM
- 90 hp @ 3800 rpm in representative 1953 and 1958 specifications
- Torque RPM
- 150 lb-ft @ 1600 rpm in representative 1958 specification
Operating Specs
- Production notes
- Nash created the 195.6 in 1952 by increasing stroke to 4.25 inches while retaining the family’s 3.125-inch bore. The L-head disappeared for 1956–1957 during the OHV transition, then returned in 1958 as the Rambler American economy engine.
Compatibility Notes
- Early 1952–1955 and 1958–1965 L-head installations differ in water-pump position and compression; external components should not be assumed interchangeable without checking year.
- Head chamber size changes compression across the 172.6/184/195.6 family, so swapping flathead cylinder heads can materially alter compression ratio.
Notable Applications
Nash StatesmanNash RamblerLater Rambler American economy versions
Strengths
- Strong low-rpm torque
- Simple construction
- Long production lineage
Weaknesses / Watch-outs
- Flathead breathing limits output
- Very long 4.25-inch stroke
- Modest high-rpm capability
Common Upgrades
- Electronic ignition
- Carburetor restoration
- Cooling upgrades
Racing History & Legacy
The 195.6 L-head was an economy engine and did not carry Nash’s principal factory racing effort. Nash’s international competition identity centered on the OHV Ambassador/Dual Jetfire sixes used in Nash-Healey sports cars.
The 195.6 flathead became one of Nash/AMC’s longest-lived legacy engines, tracing directly back to the 1941 Nash design and remaining available in Rambler Americans through 1965.
References & Image Credit
Engine image: CZmarlin (Christopher Ziemnowicz) · CC BY 4.0 · source
AMC Magazine — Rambler 195.6 engine history
technical history
AMC/Nash 195.6 family history — L-head/OHV production sequence
technical history
Automotive ignition reference — standard inline-six firing order
technical reference
AMC Magazine — Nash/Rambler 172.6, 184 and 195.6 engine-family history
technical history
1953 Nash Rambler brochure — 184 and 195.6 specifications
manufacturer brochure
Hot Rod — 1958 Rambler 195.6 flathead test/specification
period road test
Key Factory / Build Variants
Rambler American 195.6 L-head
1958–196590 hp @ 3800 rpm; 150 lb-ft @ 1600 rpm
Reintroduced economy engine with 8.0:1 compression and front-mounted water pump
Engineering Notes Worth Knowing
01
195.6 cu in / 3.2 L with 3.125 x 4.25-inch bore and stroke.
02
Cast-iron L-head inline-six.
03
Carbureted and naturally aspirated.
04
Representative output: about 90 hp and 150 lb-ft.
History · context · related reading
The Story Behind Nash 195.6 L-Head Six
The 195.6 flathead was the final and largest form of Nash's original small-six design. It remained useful long enough to return in the Rambler American even after the OHV version had been introduced.
TorqueList Garage Reference Series
See this engine inside the full Nash reference catalog.
The same Engine Library data now powers a more detailed mobile-friendly catalog with technical specs, variants, engineering notes, history and related stories.