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fixing up some sandy flood salvage, flushed the motor, all new electronics, wiring, carb and fuel system. tried several different carbs and doublecheck timing which is fine. getting a popping noise from the exhaust until the engines warms. what could I try to test to see if i have some bad valves. any other thoughts outside of electric and fuel.
 

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I no longer own it, but when I had a '67 RS it used to pop thru the exhaust because of the smog pump (or AIR) system. It was because of a bad diverter valve if I can remember right.
 

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Getting air from somewhere in the exhaust....crack or as above...bad diverter ?
 

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Verify your firing order on your plugs and ensure that each plug wire goes to the right plug. Might want to try a valve adjustment as well, ensuring that each exhaust valve returns to the closed position.
 
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