GMC L14 Specs: 3.875 x 3.25 in, 200 hp

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The same engine also has a main page: Chevrolet L14.

GMC L14 specs: 307 ci (5.0L) 8-cylinder, 3.875 x 3.25 in (98.4 x 82.6 mm) bore and stroke. Rated 200 hp, 1971–1972. Used in the Chevrolet C/K Pickup. OHV.

The GMC Small Block Chevy (L14) is oversquare — the 3.8748" bore exceeds the 3.25" stroke by 19.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.25" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 38.4 ci (629 cc).

It is one of 27 engines in the Small Block Chevy family, sitting between the 265 ci and 400 ci members. 2 factory variants share these dimensions, rated at 200 hp across 1971–1972.

Dimensions

Displacement	307 ci / 5 L
Bore	3.8748"
Stroke	3.25"
Cylinders	8
Configuration	V8
Bore/stroke ratio	1.192

Construction

Block material	cast iron
Head material	cast iron
Valvetrain	OHV
Fuel type	gas
Firing order	1-8-4-3-6-5-7-2
Advertised HP	200 hp
Years	1971–1972

Factory ratings and camshaft by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.	Duration int / exh	Valve lift int / exh	LSA
1971	gross	200 @ 4600	300 lb-ft @ 2400	—	280° / 288°	0.390" / 0.410"	113°

Factory specification sheet. Durations are the factory's advertised figures at the basis printed on the sheet, not duration at .050" lift; lobe separation is calculated from the printed valve timing.

What these numbers mean

Bore/stroke character	1.192 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves
Mean piston speed at 6,000 RPM	3,250 ft/min — conservative for a street engine
Displacement per cylinder	38.4 ci

Run the numbers for this engine

Each link opens the calculator with this engine's specs already filled in.

• Displacement from bore and stroke (calculator)
• Static and dynamic compression ratio calculator
• Piston ring gap for this bore
• Piston speed at any RPM
• Horsepower to torque at any RPM
• What size carburetor (CFM calculator)

Variants sharing these dimensions (2)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

Year	Advertised HP	Code
1971	200 hp	L14
1972	—	L14

What cars have the L14?

12 factory vehicles, 1968–1973. Each year opens that model's engine table.

• Chevrolet C/K Pickup: 1968, L14, 200 hp; 1969, L14, 200 hp; 1970, L14, 200 hp; 1971, L14, 200 hp; 1972, L14, 135 hp
• Chevrolet Caprice: 1968, L14, 200 hp
• Chevrolet Chevy Van / Express: 1968, L14, 200 hp; 1969, L14, 200 hp; 1970, L14, 200 hp; 1971, L14; 1973, L14
• Chevrolet Camaro: 1969, L14, 200 hp; 1970, L14, 200 hp; 1971, L14, 200 hp; 1972, L14, 130 hp; 1973, L14, 115 hp
• Chevrolet K5 Blazer: 1969, L14, 200 hp; 1970, L14, 200 hp; 1971, L14, 200 hp; 1972, L14, 135 hp; 1973, L14, 115 hp
• GMC Jimmy: 1970, L14, 200 hp; 1971, L14, 200 hp; 1972, L14, 135 hp; 1973, L14, 115 hp
• GMC Sprint / Caballero: 1971, L14, 200 hp; 1972, L14
• Chevrolet Chevelle: 1971, L14, 200 hp; 1972, L14, 130 hp
• Chevrolet El Camino: 1971, L14, 200 hp; 1972, L14, 130 hp; 1973, L14, 115 hp
• Chevrolet Malibu: 1971, L14, 200 hp; 1972, L14, 130 hp
• Chevrolet Nova: 1971, L14, 200 hp; 1972, L14, 130 hp; 1973, L14, 115 hp
• Pontiac Ventura: 1971, L14; 1972, L14

Similar engines

• GMC 307 — 307 ci
• GMC Small Block Chevy (1968–1972) — 307 ci
• GMC 305 — 305 ci
• GMC LG9 — 305 ci
• GMC L14 — 307 ci
• GMC LE9 — 305 ci
• Buick 307ci · 3.800" × 3.385" · 8:1 — 307 ci
• Buick 1988 307 140HP — 307 ci

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