1967 Buick GS400 Concours Restoration Guide

The 1967 Buick GS 400 is doubly significant: it is the first year of the standalone GS model AND the first year of the all-new 400 ci V-8 that replaced the aging Nailhead design. The new 400 ci engine was a completely different design from the Nailhead — modern port configuration, better breathing, and more power at higher rpm. At 340 hp and 440 lb-ft of torque, the GS 400 was a genuine big-block muscle car capable of running with the GTO and SS396.