Hi Dave,
I use the header bolts that have 7/16 hex head with built in flange like
these:
http://www.summitracing.com/parts/mrg-915a/overview/
but they have these, too:
http://www.summitracing.com/parts/mil-84541/overview/make/ford
that have 3/8" heads.
Even though they're grade 8, you *should* be able to drill them for lock wire,
with a proper fixture in a drill press and high quality drill bits. I have
Wilwood rotors and drilled the rotor to hat bolts (socket cap screws) for lock
wire.
Theo
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