87 Buick GN, 6.0L Turbo highway run (Video) 1 discussions My 6.0, S75 turbocharged buick GN on the highway. Running stock motor with cam only, 9.5psi. Stock 4l80, stock 14", 1900 stall torque converter. 275/50-15 drag radials. full 4" exhaust over the axl.. Tags: ls1 6.0 buick GN grand national turbo ls2
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