Pontiac 305ci 10.49:1 Specs
Pontiac Pontiac 305ci · 3.736" × 3.484" · 10.49:1 engine specs: 305 ci (5L), 8-cylinder, 3.736" bore x 3.484" stroke, 10.49:1 compression.
Dimensions
| Displacement | 305 ci / 5 L |
|---|
| Bore | 3.736" |
|---|
| Stroke | 3.484" |
|---|
| Cylinders | 8 |
|---|
| Configuration | V8 |
|---|
| Compression ratio | 10.49:1 |
|---|
| Rod length | 5.7" |
|---|
| Rod ratio | 1.636 |
|---|
| Bore/stroke ratio | 1.072 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 190–220 hp |
|---|
| Years | 1988–1989 |
|---|
What these numbers mean
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
|---|
| Rod ratio | 1.636 — moderate — the range most production V8s fall in |
|---|
| Displacement per cylinder | 38.1 ci |
|---|
| Static compression | 10.49:1 — in the range that usually runs on pump premium |
|---|
Cylinder head
| Intake valve diameter | 1.845" |
|---|
| Exhaust valve diameter | 1.505" |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Variants sharing these dimensions (3)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|
| 1988 | 190 hp | — |
| 1989 | 195 hp | — |
| 1989 | 220 hp | — |
Similar engines
← All Pontiac 305ci engines