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geezer#99 · 12-10-2011, 04:46 PM

THey should be 1.5 to 2 turns out. Get a vacuum gauge and set to highest vacuum. A good vac gauge is only 10-20 bucks. Shut motor off. SEt them both at 2 turns. Start truck then adjust from there. A quarter turn at a time. Alternate from one to the other. If it won't run at a couple turns out you could have a vacuum leak. Also set your idle as low as possible too with the motor warm.

12-10-2011, 04:46 PM	#25
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,787	Re: 1972 c20 running problems THey should be 1.5 to 2 turns out. Get a vacuum gauge and set to highest vacuum. A good vac gauge is only 10-20 bucks. Shut motor off. SEt them both at 2 turns. Start truck then adjust from there. A quarter turn at a time. Alternate from one to the other. If it won't run at a couple turns out you could have a vacuum leak. Also set your idle as low as possible too with the motor warm.