Editing Ford 335 engine (section)

==={{vanchor |Q-code}} (351 Cobra-Jet)===
The Q-code 351 "Cobra-Jet" (also called 351-CJ, 351-4V) was produced from May 1971 through the 1974 model year. It was a lower-compression design that used open-chamber 4V heads.<ref name="V-8 Data Book"/> The open-chamber heads exhibited superior emissions characteristics and were used to meet the more stringent emissions standards for 1972 and beyond.<ref name="Cleveland"/> The "351 CJ" high-performance engine included a different intake manifold, high-lift, long-duration camshaft with hydraulic valve lifters, higher rate valve springs with dampers, a 715-CFM spread-bore 4300-D Motorcraft carburetor and a dual-point distributor (only with four-speed manual transmissions - not sold in California). The block was upgraded to four-bolt main bearing caps, and larger harmonic balancer was installed. These engines also featured induction-hardened exhaust seats for use with low-lead and unleaded gasoline.<ref name="V-8 Data Book"/> This engine was different from the 1970-71 M-code 351C having a more aggressive camshaft, a spread-bore carburetor, a four-bolt block<ref name="Boss Registry 351C">{{cite web|title=351 Cleveland|url=http://www.boss351registry.com/351_Cleveland.htm|website=Boss 351 Registry|access-date=3 June 2014}}</ref> and the lower compression allowed regular fuel to be used.<ref name="1972 Torino Brochure">{{cite book|title=1972 Ford Torino|date=1971|publisher=Ford Motor Company|edition=Sales Brochure}}</ref> It was rated at {{cvt|280|bhp|kW PS|0}} for all 1971 applications. For the 1972 model year, the only change to the engine was a retarding the camshaft events by 4°.<ref name="Cleveland"/> The engine was rated at {{cvt|266|hp|kW|0}} (SAE net) for 1972 when installed in the Mustang, and {{cvt|248|hp|kW|0}} in the Torino and Montego.<ref name="V-8 Data Book"/> An increase in the combustion chamber size and the use of smaller valves occurred in 1973,<ref name="Cleveland"/> which reduced horsepower to {{cvt|246|hp|kW|0}} for the four-barrel for the intermediate Fords, though it still retained the higher {{cvt|266|hp|kW|0}} rating in the Mustang.<ref name="V-8 Data Book"/> The 351 CJ (now referred to as the "351 4V") was rated at {{cvt|255|hp|kW|0}} in 1974 and was only installed in the [[Ford Ranchero]], Ford Torino, Mercury Montego, and Mercury Cougar.<ref name="Hemmings Mustang">{{cite web |last1=Traver |first1=David |title=Last of the Hot Rods - 1973 Ford Mustang |url=http://www.hemmings.com/mus/stories/2010/02/01/hmn_feature7.html |website=Hemmings |date=February 2010 |access-date=3 June 2014}}</ref>