How do I lean out the cruise and richen the idle. Bought an afr gauge and the results surprised me. Reading 10.8 at WOT, 11.8 cruise and 15.0 at idle. Box stock proform 750 dp. 3 emulsion blocks all open. 74 an#80 jets. IABs .070 and hsab .028. So plugged the center emulsion other two are .028. Lowered primary jet to 70 and went for a spin. New readings were 11.1 WOT, 12.3 cruise and 14.5 idle after opening the idle mixture screw about a 1/4 turn. Idle was much better in gear. Engine is a 10 to 1 408. Home ported sm heads with 2.055 intakes. Howards solid 254 and 260 at .050, lift is .550 in. And .555 ex. On a 108 lsa. Ported rpm intake and 1.625 dougs headers and 3in. exhaust with x pipe. 8in. 4000 stall converter and 3.91 gears. Cruise rpm is 3000 to 3200. Car is 3550 with my fat *** in it.next move is to disconnect secondaries and tune primary only, the get WOT with sec. Jets.
