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 MANUALSMERCURY1966CYCLONE 6.4L ENG VIN Y, NOT AVAILABLE TRANSREPAIR AND DIAGNOSISENGINE MECHANICALMECHANICALENGINE IDENTIFICATION1970 MODELSENGINE DISPLACEMENT
1966 Mercury Cyclone 6.4L Eng VIN Y, Not Available Trans
Engine Displacement
1966 Mercury Cyclone 6.4L Eng VIN Y, Not Available TransSECTION Engine Displacement
Indicated by first entry on top line of engine identification tag attached to engine.
| Engine Code | Displ. & Carb. | Comp. Ratio | ||||||
|---|---|---|---|---|---|---|---|---|
| U | 170" 6 1-Bbl. | 9.1:1 | ||||||
| T | 200" 6 1 -Bbl. | 8.1:1 | ||||||
| 2 | 200" 6 1-Bbl. | Low | ||||||
| V, B(1), E(2) | 240" 6 1-Bbl. | 9.2:1 | ||||||
| 5 | 240" 6 1-Bbl. | Low | ||||||
| L | 250" 6-l-Bbl. | 9.1:1 | ||||||
| 3 | 250" 6 1-Bbl. | Low | ||||||
| F, D(2) | 302" V8 2-Bbl. | 9.5:1 | ||||||
| 6 | 302" V8 2-Bbl. | Low | ||||||
| G | 302" V8 4-Bbl. BOSS | 10.5:1 | ||||||
| H | 351" V8 2-Bbl. | 9.5:1 | ||||||
| M | 351" V8 4-Bbl. | 11.0:1 | ||||||
| Y | 390" V8 2-Bbl. | 9.5:1 | ||||||
| P(1) | 428" V8 4-Bbl. Prem. Fuel | 10.5:1 | ||||||
| Q, R (3) | 428" V8 4-Bbl. CJ | 10.6:1 | ||||||
| K | 429" V8 2-Bbl. | 10.5:1 | ||||||
| N | 429" V8 4-Bbl. | 11.0:1 | ||||||
| C, J (3) | 429" V8 4-Bbl. CJ | 11.5:1 | ||||||
| Z | 429" V8 4-Bbl. BOSS | 10.5:1 | ||||||
| A | 460" V8 4-Bbl. | 10.5:1 | ||||||
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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.