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Tech Question
don Tackett, Virgie, KY, 1972 dodge charger, 400
I have a 400 dodge motor that has every thing it is new cam, lifters, everything. I have a bad miss and popping from the carb. What could be my problem? I'm about ready to give up on it!
Don, 99% it's a timing problem, valves or ignition.
Since this is all well known, I'll just briefly go over the concepts. First, check the accuracy of the TDC mark using the "positive stop" method. Then be sure the ignition timing is set to around 30-35 deg. BTDC, at 3,000 RPM, with the vacuum advance temporarily disconencted. And be sure the plug wires are connected correctly - in the correct order!
If this doesn't fix it, it's a valve timing problem. If the cam is near-stock, you can use the service manual procedure to check it. But, since this is really the only other likely possibility, just pull apart the front of the engine and check to see that the timing marks on the cam and crank sprockets are correctly lined up. Aslo, be sure that the locating pin has not broken off the camshaft....remember, it's only bolt torque that keeps the sprocket correctly positioned to the cam. If the bolt isn't torqued to specs, the sprocket will snap the pin in a second and destroy the cam / crank timing relationship.
Rick
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