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Access Mercury  wiring diagrams and repair procedures. Learn how to repair, install or remove a part, reset engine lights...
Mercury 400 Engine (V8, 400 cid, 6.6L)
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This Mercury 400/6.6L engine/motor can fit the Montego, Cougar, Grand Marquis, Marquis, Colony Park, Monterey and some other Mercury car and/or truck applications - for more details see your automobile manual.

1975 - 1978

1975 Mercury 400 Smog in heads.
Engine DescriptionSizeVINPrice/Core
1975 Mercury 400 Smog in heads.

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1971 - 1974

1972 Mercury 400 Without smog.
Engine DescriptionSizeVINPrice/Core
1972 Mercury 400 Without smog.

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For troubleshooting tips and repair information on the Mercury 400/6.6L engine, please visit our Information page.