GBF035-1 - 1978-1988 GM G-Body Handling Kit, 1” Lowering- Stage 3.5Spring Heights: Springs are intended for small block engine. Lightweight LS engines may require trimming and an additional 1 4" front end drop may occur with a full weight big block. When choosing desired height, 1 lowering tends to sit just slightly lower than factory while 2 lowering offers a mild well rounded lowered look still allowing proper suspension travel.