I have replaced the 8" balancer with a 6.75" and replaced the rubber valve seals and now my 350 runs really rough and feels like the truck is going to fall apart. Is this from the balancer or did I adjust the valves wrong? I also removed the carb while changing the valve seals but I doubt this had any effect.
More than likely the valves are out of adjustment. It`s also possible if you removed any of the plug wires you may have some crossed. 5 and 7 are side by side and fire beside each other as well, if you get these wrong it`ll run as you discribed.
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