The S-55’s big-block 428 wasn’t a Mercury-only engine — it was the exact same "Super Marauder" V8 that powered the Ford Galaxie 500 7-Litre that same year.
Lead trim: S-55 428 cu in Super Marauder V8 (345 hp, 1966)
Mercury S-551966–1967
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Nobody in Burbles has spotted a Mercury S-55 yet. See one on the street, point the app at it, and the first card is yours — with your @handle permanently credited on this page.
FactThe S-55’s big-block 428 wasn’t a Mercury-only engine — it was the exact same "Super Marauder" V8 that powered the Ford Galaxie 500 7-Litre that same year.
For 1966 the S-55 returned as a stand-alone model, the only S model to make a return: as in 1962, solely two-door hardtops and convertibles, again based on the Monterey, with a bucket-seat interior with a floor-mounted shifter and a higher-performance powertrain. Styling accents included unique body side-striping, deluxe wheel covers, the distinctive S-55 emblem on the rear quarter panel and 428 V-8 emblems on the front fender sides; the hardtop listed at US$3,292 with 2,916 sold (the convertible 669). In place of the 390 and 427 the 1966 S-55 had a single engine, a 345 hp "Super Marauder" 428 cubic-inch V8 paired to a 4-speed manual or the 3-speed Merc-O-Matic automatic, the same engine as the 1966 Ford Galaxie 500 7-Litre. For 1967, poor sales demoted the model to the "S-55 Sports Package" (570 hardtops and 145 convertibles per the data sheet) and it was dropped during the model year as Mercury concentrated its two-door efforts on the smaller Cougar and the more luxurious Marquis; the Mercury Marauder largely replaced it, produced through 1970.
Collectors Spotted in the Mercury S-55 Lineage
No member has published a public street spot of the Mercury S-55 yet — the First · Worldwide stamp is wide open.
Trims & Figures
One published trim in the catalogue. A blank is a figure not recorded, not zero.
| Trim | Years | Engine | Power | Torque | 0–60 | Drive | Gearbox | MSRP |
|---|---|---|---|---|---|---|---|---|
| S-55 428 cu in Super Marauder V8 (345 hp, 1966) | 1966–1966 | V8 | 345 hp | 462 lb-ft | — | RWD | — | — |
Owning one
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Owners’ builds
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Photographs
The S-55’s big-block 428 wasn’t a Mercury-only engine — it was the exact same "Super Marauder" V8 that powered the Ford Galaxie 500 7-Litre that same year.
Mercury's S-55 package turned a plain Monterey into a bucket-seat performance special, with its own 405 hp 406 V8 not offered on the standard car.
Rivals
Same body, same money, other badges — tap any card to flip.
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