1969 Buick GS400, 455 engine, Headers, 2.5" dual exhaust, Exhaust Dumps, battery cutoff switch,Electric coolant fan, New Black interior, automatic transmission. This is a beautifully restored 69' Buick GS400 with the larger 455 Buick engine. Fast!!...exhaust dumps really let you feel the power of the 455. 455 engine was professionally built by Kenne Bell in California and only has 2,580 miles on it.