They don't actually lift the ride height. They install on the upper ball joint, allowing more rise on the front end for better weight transfer. Basically for drag racing.
They will lift the height, but only if you also change to longer or heavier springs at the same time. But they always looked sketchy to me and I'd never use them.
I found a set of those on Flee bay one time and was tempted to buy them for my '56, but then I started to question my sanity and intelligence level's and said to myself, quietly... **** This!
Here ya go A long time ago, we used something like this to lower. Space the lower ball joint and use a stock or cut spring
By using those you introduce (what an Engineer would call) a third hinge. If you look at arch bridges they don't have 3 points that can move independently as they will fail. I did similar on OT Porsche 911 used in desert racing to raise the front suspension and the struts snapped the tops off of them. Real scary engineering.
I remember NHRA outlawed them in the early 70's. The kind like above that were mounted with the 3 bolts, They were made out of some junky aluminum. They suddenly became the hot ticket on the stock and super stock cars. I guess they had a few accidents and outlawed them. A friend raced Saturday with them at one track and on Sunday could not race until they were off. He said there was panic in the pits that morning.
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