  4.6L Best performance up to 6600 rpm. Lumpy idle, good driveability down to 2100, performance range 2700-6500 rpm. Must have AFM performance valve spring kit. Works best with 80mm mass air, 70mm throttle body and TFS or Dragon Plenum. Headers and ported P.I. heads highly recommended. Gears 3.73 to 4.30. With automatic transmission needs 3000-3200 converter. |
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