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 MANUALSCHEVROLET1966CHEVY II BASE, NOT AVAILABLE, 2.5L ENG, AUTOMATIC TRANS, TRANS MFR CD THM400REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPTUNE-UP - V8ENGINE IDENTIFICATIONCOMPRESSION PRESSURE
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400
Compression Pressure
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400SECTION Compression Pressure
At cranking speed with throttle wide open and all plugs removed. Maximum variation between cylinders 15 lbs.
| 283" | 150 lbs. | |
| 327", 250, 275, 300 HP | 160 lbs. | |
| 350 HP | 150 lbs. | |
| 396" | 160 lbs. | |
| 427" 390 HP | 160 lbs. | |
| 425 HP | 150 lbs. | |
VALVE TAPPET CLEARANCE
| All Except 427" 425 HP | Zero Lash, Hydraulic |
| 427" 425 HP | .020" Int..024" Exh. (Hot) |
RENDER: 1.0x
NO RELATED
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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.