Buick loaded its GS model with luxuries, but also gave it a powerful engine so it could hold its own amongst the street-fighter muscle cars of 1969. The drive was "o i v 4iiid the handling would turn to understeer when pushed, but in a straight line, it was incredible. Its 400ci (6.6-liter) 'Nailhead' engine is a bored and stroked version of the 340. The 400 got 11:1 compression ratio, a four-barrel carb, low-restriction exhaust and cold-air hood induction which was claimed to an 8 per cent increase in power. An uprated GM Turbo-Hydramatic three-speed auto was the transmission, and further back was a Positraction limited-slip differential to help put the power down through skinny bias-ply tyres. The fastback coupe was the most body style, though the convertible has remained the most desirable, as just 1,776 were made. In 1970, the GS 400 was replaced by the GS 455.
Buick GS 400 Specifications
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