For 1966, the Monterey underwent some minor styling revisions. The taillights were redesigned (removing the lower lenses from the bumper), adding chrome trim bands; the side front fender vents were redesigned. Two-door hardtops received a new roofline with thinner C-pillars. The engine lineup underwent multiple changes, as the 390 was increased to 265 hp (275 with automatic); the Super and Interceptor versions were dropped, replaced by a 330 hp 410 cubic-inch V8 (exclusive to Mercury). The 427 V8 (largely a racing engine) was dropped, with Mercury introducing a 345 hp 428 cubic-inch V8 as its most powerful engine option.