Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1968IMPALA 2D CONVERTIBLE, 5.3L ENG, NOT AVAILABLE TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPTUNE-UP - V8ENGINENOTES
1968 Chevrolet Impala 2D Convertible, 5.3L Eng, Not Available Trans
Tune-Up - V8: Engine: Notes
1968 Chevrolet Impala 2D Convertible, 5.3L Eng, Not Available TransSECTION Notes
GENERAL SPECIFICATIONS
| Engine | HP at RPM | Torque (Ft. Lbs. at RPM) | Compr. Ratio | Bore | Stroke | Displ. Cu. Ins. | ||
|---|---|---|---|---|---|---|---|---|
| 302" 4-Bbl. | 290 at 5800 | 290 at 4200 | 11.0-1 | 4.00" | 3.00" | 302 | ||
| 307" 2-Bbl. | 200 at 4600 | 300 at 2400 | 9.0-1 | 3.875" | 3.25" | 307 | ||
| 327" 2-Bbl. | 210 at 4600 | 320 at 2400 | 8.75-1 | 4.00" | 3.25" | 327 | ||
| 4-Bbl. | 250 at 4800 | 325 at 3200 | 8.75-1 | 4.00" | 3.25" | 327 | ||
| 275 at 4800 | 355 at 3200 | 10.0-1 | 4.00" | 3.25" | 327 | |||
| 300 at 5000 | 360 at 3400 | 10.0-1 | 4.00" | 3.25" | 327 | |||
| 325 at 5600 | 355 at 3600 | 11.0-1 | 4.00" | 3.25" | 327 | |||
| 350 at 5800 | 360 at 3600 | 11.0-1 | 4.00" | 3.25" | 327 | |||
| 350" 4-Bbl. | 295 at 4800 | 380 at 3200 | 10.25-1 | 4.00" | 3.48" | 350 | ||
| ! 396" 4-Bbl. | 325 at 4800 | 410 at 3200 | 10.25-1 | 4.094" | 3.76" | 396 | ||
| 350 at 5200 | 415 at 3400 | 10.25-1 | 4.094" | 3.76" | 396 | |||
| 375 at 5600 | 415 at 3600 | 11.0-1 | 4.094" | 3.76" | 396 | |||
| 427" 4-Bbl. | 385 at 5200 | 460 at 3400 | 10.25-1 | 4.25" | 3.76" | 427 | ||
| (Rochester) | 390 at 5400 | 460 at 3600 | 10.25-1 | 4.25" | 3.76" | 427 | ||
| (Holley) | 425 at 5600 | 460 at 4000 | 11.0-1 | 4.25" | 3.76" | 427 | ||
| 430 at 5200 | 450 at 4400 | 12.5-1 | 4.25" | 3.76" | 427 | |||
| Three 2-Bbl. | 400 at 5400 | 460 at 3600 | 10.25-1 | 4.25" | 3.76" | 427 | ||
| 435 at 5800 | 460 at 4000 | 11.0-1 | 4.25" | 3.76" | 427 | |||
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.