i also worked at a GM dealership as mechanic in late 70s and 80s . to cure dieseling the idle had to be slowed down. thats why GM had electric idle solenoids on the carburators. you set the carb idle screw so the throttle plates were completely closed or next to it then the idle was adjusted with the electric solenoid adjustment to get your idle speed. then when you turned the key off power was cut to the solenoid which resulted in the throttle plates closeing preventing dieseling . example the 427 was bad for that. it was more of an idle thing than timing . timing was checked also and if anything it would be set a couple degrees to the retarded side from the factory setting. and yes advancing timing increases engine RPM.my experience with dieseling is your idle is set too high. slow it down and problem solved.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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