79 jeep cj5 spark knock.
I have a cj5 with a 258. Bbd carb. 3 speed trans.
I blew the radiator one day and overheated to prolly 250?? . Since then I have noticed a very loud knock from the motor once a operating temp, but only while revving up. Nothing at idle. Un hook the vacuum advance. Noise goes away. Maybe its advancing the timing too far. ?? What is the tollerance on vacuum advance? ?
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