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Porsche M64 (1994–1997) specs: 3.6L (219.7 ci) 6-cylinder, 100 x 76.4 mm (3.9370 x 3.0079 in) bore and stroke. Rated 380-424 hp, 1994–1997.
The Porsche M64 (1994–1997) is oversquare — the 3.937" bore exceeds the 3.0079" stroke by 30.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.0079" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 36.6 ci (600 cc).
It is one of 7 engines in the M64 family, all of them 219.7 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated from 380 to 424 hp across 1994–1997.
| Displacement | 219.7 ci / 3.6 L |
|---|---|
| Bore | 3.937" |
| Stroke | 3.0079" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.309 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 380–424 hp |
| Years | 1994–1997 |
| Bore/stroke character | 1.309 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,008 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.6 ci |
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 |
|---|---|---|
| 1994 | 380 hp | — |
| 1997 | 424 hp | — |