Editing Ford 335 engine (section)

===H-code===
[[File:1973 Ford Mustang convertible 351-2V Cleveland.JPG|right|thumb|250px|1973 H-code 2V 351 Cleveland]]

The H-code 351 Cleveland engines were low performance engines with low compression and two-barrel carburetors. All H-code engines ran on regular grade fuel. Compression ratio was 9.5:1 in 1970 and progressively dropped annually until it reached it low point of 8.0:1 compression in 1973 and 1974.<ref name="CC 351C pt2">{{cite web |title=The Ford 335 Series V8 Engines (351C, 400, 351M) – It Could've Been a Contender, Part 2 |url=https://www.curbsideclassic.com/blog/engines/the-ford-335-series-engines-it-couldve-been-a-contender-part-2/ |website=Curbside Classic |publisher=Curbside Classic |access-date=23 February 2020}}</ref> H-code 351s were equipped with a cast-iron crankshaft, two-bolt main bearing caps, forged-steel connecting rods, cast-aluminum pistons, non-adjustable valve train, and cast-iron intake and exhaust manifolds.<ref name="V-8 Data Book">{{cite book|last1=Sessler|first1=Peter|title=The Ultimate V-8 Engine Data Book|date=2010|publisher=Motorbooks International|location=Minneapolis, MN|edition=2nd}}</ref> All H-code 351 Cleveland engines used the small port 2V heads with open combustion chambers.<ref name="Cleveland"/> These engines were produced from 1970 through 1974 and were used on a variety of Ford models, from pony-car to full-sized.<ref name="V-8 Data Book"/> The 351W with a 2V carburetor was also produced during this time which also used the "H-code" designation. Both the 351W and 351C H-code had the same or very similar power ratings, and were used interchangeably when a car was built with the H-code engine option.<ref name="CC 351C pt2"/><ref name="Petersens Big Book">{{cite book|title=Petersen's Big Book of Auto Repair|date=1976|publisher=Petersen Publishing|location=Los Angeles, CA}}</ref>