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GMC L05 specs: 350 ci (5.7L) 8-cylinder, 4.00 x 3.48 in (101.6 x 88.4 mm) bore and stroke, 9.3:1 compression. Rated 200-210 hp, 1987–1995.
The GMC Small Block Chevy (L05) is oversquare — the 4" bore exceeds the 3.4799" stroke by 14.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.4799" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.638 is in the range most production engines fall in. Each of the 8 cylinders displaces 43.8 ci (717 cc).
9.3:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 27 engines in the Small Block Chevy family, sitting between the 265 ci and 400 ci members. 17 factory variants share these dimensions, rated from 200 to 210 hp across 1987–1995.
| Displacement | 350 ci / 5.7 L |
|---|---|
| Bore | 4" |
| Stroke | 3.4799" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.3:1 |
| Rod length | 5.7" |
| Rod ratio | 1.638 |
| Bore/stroke ratio | 1.149 |
| Deck height | 9.025" |
| 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 | 200–210 hp |
| Years | 1987–1995 |
| Engine weight | 575 lb (approximate; published figures vary with what is attached) |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. | Duration int / exh | Valve lift int / exh | LSA |
|---|---|---|---|---|---|---|---|
| 1988 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | 9.3:1 | 310° / 320° | — | 112.5° |
| 1989 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | 9.3:1 | 310° / 320° | — | 112.5° |
| 1990 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | 9.3:1 | 310° / 320° | — | 112.5° |
| 1991 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | 9.3:1 | 310° / 320° | — | 112.5° |
| 1992 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | 9.3:1 | 310° / 320° | — | 112.5° |
| 1993 | L05 net | 210 @ 4000 | 300 lb-ft @ 2800 | — | — | — | — |
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.
| Bore/stroke character | 1.149 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,480 ft/min — conservative for a street engine |
| Rod ratio | 1.638 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 43.8 ci |
| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1987 | — | L05 |
| 1988 | — | L05 |
| 1988 | 210 hp | L05 |
| 1989 | — | L05 |
| 1989 | 210 hp | L05 |
| 1990 | — | L05 |
| 1990 | 210 hp | L05 |
| 1991 | — | L05 |
| 1991 | 210 hp | L05 |
| 1992 | — | L05 |
| 1992 | 210 hp | L05 |
| 1993 | — | L05 |
| 1993 | 210 hp | L05 |
| 1994 | — | L05 |
| 1994 | 210 hp | L05 |
| 1995 | — | L05 |
| 1995 | 200 hp | L05 |
12 factory vehicles, 1987–1996. Each year opens that model's engine table.