My "new" '74 Duster- or why I need a project like a hole in the head
I've done it two different ways at this point. Right now it's with a set of SPC UCA's from @BergmanAutoCraft, they have more than enough adjustment to get even more caster than that although on my car at least I've found that ~6.5° is the sweet spot. If I go too much under +6° the tracking tendency of the wide 275 front tires becomes more noticeable. But much above +6.5° and the resistance to turning starts increasing exponentially, it starts getting a lot harder to turn the wheels past about +7°.
The other way I managed that much + caster was actually with a non-adjustable set of magnumforce UCA's, but with K7103 offset bushings installed into them. I was actually able to get about +8° with that set up, which I accidentally discovered by just setting a rough "max caster" alignment because I didn't think it would be nearly that much and found out later when I did a proper alignment how much caster I had actually dialed in. The problem with doing it that way is that you're committed to running at least +5° or more of caster, because all you've got is the camber bolts to do the adjusting.
I've done it two different ways at this point. Right now it's with a set of SPC UCA's from @BergmanAutoCraft, they have more than enough adjustment to get even more caster than that although on my car at least I've found that ~6.5° is the sweet spot. If I go too much under +6° the tracking tendency of the wide 275 front tires becomes more noticeable. But much above +6.5° and the resistance to turning starts increasing exponentially, it starts getting a lot harder to turn the wheels past about +7°.
The other way I managed that much + caster was actually with a non-adjustable set of magnumforce UCA's, but with K7103 offset bushings installed into them. I was actually able to get about +8° with that set up, which I accidentally discovered by just setting a rough "max caster" alignment because I didn't think it would be nearly that much and found out later when I did a proper alignment how much caster I had actually dialed in. The problem with doing it that way is that you're committed to running at least +5° or more of caster, because all you've got is the camber bolts to do the adjusting.