I've run the del-alums in leafs front and rear before. I thought they were fine in bump and did not really add noticeable harshness. The spring rate for the leafs seems to be main determining factor for that. They do cause some extra stiffness in roll, based on having the fronts not allowing the springs to pivot at all, but it seems predictable so I did not run a sway bar when I used them. They definitely help keep the side to side reduced for those who do not run a panhard.
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1970 Mach I 380 Dry Sump + lots of mods
1990 C4 Corvette 400 in solid roller
1965 Corvette - back to life some day
1970 1/2 Z28 project car
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