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Ford 302ci specs: 302 ci (4.9L) 8-cylinder, 4.002 x 3.00 in (101.7 x 76.2 mm) bore and stroke, 8.502:1 compression. Rated 122-137 hp, 1977.
The Ford 302ci is oversquare — the 4.002" bore exceeds the 3" stroke by 33.4% — a layout that favors airflow and RPM over leverage at the crank. The 3" 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. A rod ratio of 1.697 is in the range most production engines fall in. Each of the 8 cylinders displaces 37.8 ci (619 cc).
8.502:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 37 engines in the Ford 302ci family, all of them 302 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated from 122 to 137 hp in 1977.
| Displacement | 302 ci / 4.9 L |
|---|---|
| Bore | 4.002" |
| Stroke | 3" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8.502:1 |
| Rod length | 5.09" |
| Rod ratio | 1.697 |
| Bore/stroke ratio | 1.334 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 122–137 hp |
| Years | 1977 |
| Bore/stroke character | 1.334 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,000 ft/min — conservative for a street engine |
| Rod ratio | 1.697 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 37.8 ci |
| Static compression | 8.502:1 — low by modern standards, generally happy on regular pump fuel |
| Intake valve diameter | 1.791" |
|---|---|
| Exhaust valve diameter | 1.46" |
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 |
|---|---|---|
| 1977 | 122 hp | — |
| 1977 | 130 hp | — |
| 1977 | 137 hp | — |