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Welcome to the board, had a 83 Grand Prix with a 400 Pontiac that ran 13.5 @ 102 with 2.73 gears. There's a few other Pontiac guys on this board to. Buy a 8.5 out of a 84-87 GN or T-Type. They are kind of pricey though.
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Eric
1987 Turbo Regal -PTE-44 Turbo, Mototron 60# inj, TT 93 street chip, Walbro 340 w/ Hotwire kit, KB AFPR, Kirban 100# valve springs, RJC Power Plate,CAI, Autometer oil, water and SW boost gauge, F-body radiator, 160 thermostat, ported exhaust elbow, 2 3/4 pipes, 3" Dynomax Super Turbo mufflers, Scanmaster 2.1 (Best Pass 13.37@104mph)
1962 Grand Prix - 455, 4100 lbs, 2.73 gears = 13.14@107.64
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