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What should the timing be set to on a 86' GMC pickup with a 305 ci. ?
Country: United StatesMake: GMCModel: 1500 High SierraYear: 1986Engine: 305 ci.
4 degrees
Which vacuum line do i plug?
remove the vacuum line off the vacuum advance on the distributer and plug it off then set it to 4 degree's
Experience: 15 years gm master tech/15 years ASE master tech