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the Ford 335 series or Cleveland engine family has the 351C, 351M, 400. If you just consider the heads you can add the 302 Boss. some mods are needed for these heads.
The "Cleveland" family, properly referred to as the "335 series", consists of the 351 Cleveland, 351M, and 400. The Cleveland name was issued by Ford to differentiate the the engine from the "Windsor". Helpful when there is two completely different engines of the same displacement in production at the same time.
The "Windsor" family has 221, 260, 289, 302, 351 Windsor.
The "385" family has 370, 429, 460.
The FE family has 352, 360, 390, 406, 410, 427, 428.
This is probably a little basic and incomplete but should help.
Main Entry: splay
Function: verb
Etymology: Middle English, short for displayen -- more at DISPLAY
Date: 15th century
transitive senses
1 : to cause to spread outward
2 : to make oblique : BEVEL
intransitive senses
1 : to extend apart or outward especially in an awkward manner
2 : SLOPE, SLANT
Main Entry: cant
Function: verb
Date: circa 1543
transitive senses
1 : to give a cant or oblique edge to : BEVEL
2 : to set at an angle : TILT
3 chiefly British : to throw with a lurch
intransitive senses
1 : to pitch to one side : LEAN
2 : SLOPE
So, when looking at the heads from the top, where angles of the valve stems diverge, you could say the valves are "splayed." Obviously, when looking from the bottom, that would not be true.
In their technical literature, Ford referred to this design feature as "canted valves."