what are their current installed height? reading this, coil bind height is 1.15" (1.75" IH, coil bind at .6" lift), so open height you'll want to be no less than 1.18". my magnums with 2.2L retainers and hughes 1110 springs had an install height of 1.62"....if your are similar, that would limit lift capacity to ~.44".

you sure they aren't these springs? they have a coil bind height of 1.040"...

if they are actually the 1102's, I'd replace them with the 1110's...