Mechanical revisions for 1961 included new carburetors, the availability of positive crankcase ventilation (which was newly mandated on cars sold in California), the availability of dealer-installed air conditioning, the relocation of the alternator from the left to the right side of the engine, and extensive revisions throughout most of the Valiant's systems and components. Late in the 1961 model year, the larger Slant-6 engine became available in the Valiant, its use having been expanded earlier in the year from the larger Dodges and Plymouths to the Valiant-sized Dodge Lancer.