I do remember reading an explanation for the smaller intake valve in 1970 ... unfortunately I can't find that explanation in my stack of stuff ... but going by memory I believe the smaller valve helped the port work better at lower engine speeds ... especially when used in a 302 cubic inch motor. Joe is the techie ... he'll have the hot dope.
Blizz ... use the bigger valve in strokers? ... Homie didn't do strokers in the 1970s and 1980s.
The Cleveland cylinder head is Ford's second generation canted valve head ... it differs from the 385 series head in ways that in my opinion were improvements. The transverse valve angles (side cant) of the 385 series head are 15 degrees, in the Cleveland those angles were 9-1/2 degrees. The 385 series combustion chamber appears very "wedge-like". It is shallower than the wedge heads in that era, but it is "deeper" than the Cleveland combustion chamber. The Cleveland combustion chamber in contrast leaves no doubt that it is a poly-angle combustion chamber, it has no wedge characteristics at all.
-G
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If you use a 351C 4V powered vehicle for a grocery getter ... the eggs aren't going to make it home!
