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UMI 1" lowering spring set for 1964–1966 GM A‑body vehicles offers a modest drop with modern handling characteristics. Front springs are wound from 5160 CrSi premium wire at a linear 530 lb/in rate; the rear springs use 9254 CrSi at 130 lb/in to reduce body roll and eliminate the floating feel. Engineered for standard SBC, Pontiac 400 and many Big Block or LS setups, these powder coated springs are suitable for Auto‑x, Pro‑Tour and street cruising and are made in the USA.
UMI Performance 64-66 GM A-Body Spring Kit 1in Lowering
