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Old 07-03-2003, 09:03 PM
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Last edited by CAD; 07-06-2003 at 09:22 PM.
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Old 07-05-2003, 08:16 AM
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With out getting to much in timing, if it was retarded it shouldnt keep running on when shut off, it would be missing and sometimes a backfire, advance unit may be sticking.
It sounds like a jetting problem. Go down 3 jet sizes if really black on the plugs. Just because the carb ran good on one engine dont mean it will run great on another even if the same type.
Holly has a free downloadable manual and troubleshooters guide that you may want to print out. Please email me if you need any other help.
http://www.holley.com/HiOctn/TechSer...o/FMCTech.html
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Old 07-05-2003, 09:13 AM
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Old 04-29-2012, 07:05 AM
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383 afr heads tuning

mine is pump gas i run 750dp factory 70 jets in front 80 in rear and runs 12.8 on afr meter 18 initial and 36 all in at 2500 rpm
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