Here is some information compiled off the TB site regarding springs for the Turbo Buicks.
Front Springs
Moog 5604: stock 346lbs.
5606: stock 420lbs.
5660: S-10 639lbs. (slight .25" drop)
5662: Iroc 706lbs. (slight raise)
Moroso Trick: slight drop, lack of handling on the street
Rear Springs
Moog 5379: stock 121lbs.
5401: (1.25" drop)
5779: (slight raise)
6319: (.75" drop)
CC627: (slight raise)
Front and Rear Kits
Eibach Pro: (1.25" front, 1.5" rear)
Front Springs
Moog 5604: stock 346lbs.
5606: stock 420lbs.
5660: S-10 639lbs. (slight .25" drop)
5662: Iroc 706lbs. (slight raise)
Moroso Trick: slight drop, lack of handling on the street
Rear Springs
Moog 5379: stock 121lbs.
5401: (1.25" drop)
5779: (slight raise)
6319: (.75" drop)
CC627: (slight raise)
Front and Rear Kits
Eibach Pro: (1.25" front, 1.5" rear)
