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Choose OneEngine Assembly for 1978 Mercury Monarch
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There are 5 choices for the 1978 Mercury Monarch Engine Assembly !!!
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MERCURY 8 Cyl, 400 cid
MERCURY 8 Cyl, 460 cid
MONARCH 6 Cyl, 250 cid (4.1L)
MONARCH 8 Cyl, 302 cid (5.0L)
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