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    How much leaner with headers?

    So long story short. I put a FAST AFR datalogger on my '64 dart. (Mild 360 4spd. Stock 1.88/1.60 Jheads, LD340 Street Demon 750, Comp Cams 268AH10, 9.4:1 actual cr, 340HP exhaust manifolds, 2.25 head pipes, 2.5" after the muffler) Anyways, at idle I'm 13.5-14.5:1, cruise 11.5:1 and at wot...
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