Pontiac OHC-6 9:1 Specs
Pontiac Pontiac OHC-6 · 3.874" × 3.531" · 9:1 engine specs: 250 ci (4.1L), 6-cylinder, 3.874" bore x 3.5315" stroke, 9:1 compression.
Dimensions
| Displacement | 250 ci / 4.1 L |
|---|
| Bore | 3.874" |
|---|
| Stroke | 3.5315" |
|---|
| Cylinders | 6 |
|---|
| Compression ratio | 9:1 |
|---|
| Bore/stroke ratio | 1.097 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | SOHC |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 165–175 hp |
|---|
What these numbers mean
| Bore/stroke character | 1.097 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,532 ft/min — in the range typical of performance street engines |
|---|
| Displacement per cylinder | 41.7 ci |
|---|
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Variants sharing these dimensions (4)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|
| — | 165 hp | OHC-6, 250 |
| — | 175 hp | 250 OHC-6 |
| — | 175 hp | OHC-6 |
| — | 175 hp | OHC-6 250, OHC-6 (250ci 1-barrel), 250 OHC, 250 OHC-6, OHC-6 |
Vehicles (6)
- Pontiac Firebird
- Pontiac LeMans
- Pontiac Tempest
- Firebird
- LeMans
- Tempest
Similar engines
← All Pontiac OHC-6 engines