Thread: 67' c10 w/ 327

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sounds like to me you might have a timing problem, but you say, The timing is set at 16 degrees advance at idle, and with a shorter mechanical advance overall, im not sure what you mean there. do you mean that the mechanical advance is less than 16 degrees? i dont know what the idle timing is but 16 base timing is to much. how have you got your vac. adv. hooked up?check these things first. get your base timing right(8-12 degree)make sure your vac. adv. is hooked up right and check and make sure your mechanical adv. is not froze up (some time the hei weights will freeze up, take the rotor button off and clean the weights), hook the vac. to the dist. so you will have vac when you give it gas, not idling. pick up the vac. above the carb. betterflys. the idle problem could be a low vac. thing also. have you checked to see how much vac. the motor is pulling? get your timing right and see what you have, check you vac. let us know what you got.