IDK that's what he said "4 thousandths"
Just a wee bit. I assume they had a reason for such a tiny bit...
After speaking to my dad more about it, he just said that he has some slightly shorter rods he can put in, but the stock rods, stock gasket, not too big cam, stock-sized stealth heads, hydraulic lifters, etc... seem to indicate a very stock length with a bit of tolerance in the mix...
Also, I assume the 0.004 milling was just to square it up?