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The high octane leaded will make a tailpipe burn"white". It doesn't take very much leaded fuel to eat an o2 sensor, I've done it before on 5 or so gallons. The lead will do a number on your plugs too after a while, deposits etc.
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86 T- .40 over stock bottom end w/forged pistons, 205/205 Reeds,pump and hotwire, TT chip, TE45a, Cottons fmic, Champion irons, Champion fuel rails, Precision plenum, Magnacore wires, Accufab afpr, 60lb Siemans, RJC aluminum pulleys and Champion alt relocation and a/c delete bracket, 3"ssthdp and cutout, 3" single shot, CK Performance stage2 trans w/3200-3400 Pro-Torque l/u converter, brake and deep pan, Eaton posi, PTE turbo saver, Trans plus and 3"Ls1 maf, 90/10 fronts, Gabriel upgraded stock rears, Global West rear sway, UMI lca's, no front sway. Rabbits foot on rear view mirror. Vanity: JUSTASIX 
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