another control arm question

for some reason this drives me crazy, but it seems like every production set of control arms out there, the upper ball joint angle is always just FLAT, no angle whatsoever, and somehow they will lay out on big wheels, how are they accomplishing this? Longer control arms, different ball joints? Also what would be a safe amount of caster to add on a set of uppers? thanks again max, my uppers im building should be done thise week!

I don't know what they are doing on their arms, I'm not a fan of "one size fits all" arms anyways. I'm not sure what you mean by "castor on a set of uppers." Castor is the amount of angle that a line drawn through the upper and lower balljoints creates. An upper arm would have some angle if you were trying to induce some anti-dive, and that would create castor-gain, but the arm itself does not have castor.

AH ok, so its more in the actual positioning of the arm then anything?

The position of the points is what makes the suspension do what it does, the angle of the ball joints just allows the suspension to use a certain part of its travel.