M_Dragan Posted September 5, 2017 Share Posted September 5, 2017 Hi guys, I'm trying to give my sbc 10 - 12 degrees of initial timing. However when I do this, I can't bring the idle back down to 950, its stuck around 1500 rpm. I took a closer look at the carb (edelbrock 600 cfm) and it looks like the idle speed screw is completely disengaged from the throttle assembly. Has anyone else had this problem? FYI: choke is fully off and I can't pull the assemble closer to the speed screw. it feels like it won't go any further. Attached below is a picture of my problem. Thanks! Quote Link to comment Share on other sites More sharing options...
jt1 Posted September 6, 2017 Share Posted September 6, 2017 Check to see if the throttle blades are fully closed. If so, check for any vacuum leaks. Quote Link to comment Share on other sites More sharing options...
grillhands Posted September 10, 2017 Share Posted September 10, 2017 (edited) Make sure you disconnect your vac advance when setting intial timing. Are you using HEI ignition? Also, you may need to adjust your mixture screws. You have 3 types of timing: intial, vac, and mechanical. Total timing should be around 36-39 depending on setup. Total timing is mechanical+intial. Vac only comes in during cruising and goes to zero at full throttle. Check your spring weights as well in your distributor Edited September 10, 2017 by grillhands Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted September 18, 2017 Author Share Posted September 18, 2017 Thanks guys! Quote Link to comment Share on other sites More sharing options...
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