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.
Engine Code Location
Engine Code is stamped on right side of engine block, directly to rear of distributor on all 6-cylinder engines, V8 engines are identified by a code tape, installed directly above engine unit number, which is stamped on engine oil fill tube.
| Engine | Code Letters |
|---|---|
| 250" 6-Cyl. 1-Bbl. | CCC, CCD, CCA, CCB |
| 350" V8 2-Bbl. | QQ, QP, QS, QT, QN, QO |
| 350" V8 4-Bbl. | QA, QB, QD, QE, QJ QC, QU, QL, QK, QV |
| 455" V8 4-Bbl. | UD, UA, UB, US UT, UU, UV |
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.