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The head castings and valve head sizes from 1969 to 1976 were different, notably in passages for air injection and spark plug diameters (1969–1974 18 mm, 1975 and up 14 mm). From 1977 onward, the 351W shared the same head casting as the 302, differing only in bolt hole diameters (7/16 inch for the 302, 1/2 inch for the 351W).
Two cylinder-head designs were developed, one similar to the 351W, but with larger ports and valves, and the other with very large ports with canted intake and exhaust valves similar to the big-block Ford 385 series V8. Sales, marketing, and product planning favored the canted valve design, as it was viewed as more innovative. [1] [4]
Aluminum offers lighter weight at the expense of strength, hardness and often cost. However, with care it can be substituted for many of the components and is widely used. Aluminum crank cases, cylinder blocks, heads and pistons are commonplace. The first airplane engine to fly, in the Wright Flyer of 1903, had an aluminum cylinder block. [1]
Ford 351 Windsor (351W), an engine part of the Ford 90 degree V family Ford 351 Cleveland (351C), an engine part of the Ford 335 family Ford 351 M (351M), an engine part of the Ford 335 family
2017–2021 1.2 L Dragon Ti-VCT I3, naturally aspirated. Based from 1.5 L Dragon engine but with smaller piston and without balancer shaft. [2]Displacement: 1194 cc
The 351W has a higher deck-height (and thus a longer stroke potential) than the 302W, but both could swap heads. The fully assembled 351W was taller and wider, so the 302W was more compact, leading to the 302W version being popular for swaps into smaller cars, which could be much lighter than the common sedan or truck that it was found in.
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Note: The 250-I6 is derived from the Falcon line (144-170-200). U.S. versions were only available with an integral cast head and intake making them only able to accept a one-barrel carb. Foreign versions were also made with typical two-piece intake and head. 1973–1983 302 cu in (4.9 L) Windsor 351W 5.8L light truck/van
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