Valve size isn't dependant upon the size of the eyebrow in the piston (rather it is the other way around, the eyebrow should be dependant on valve size, but most pistons have large reliefs cut into them so that they can support a variety of configurations).
I believe valve size is dependant on the bowl size behind the valve and how well it flows.
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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