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Better driveability especially during warmup in cool climates. They would get plugged up then cause choke opening issues, when the heat riser failed to push the exhaust through intake man.



This carbon blocked intake indeed happens, saw it happen twice on my cousins 70 340 swinger. My 69GTX had a blocked off intake runner when I bought it. I opened it back up to make the stock automatic choke work correctly. It gets a little warmer but choke works great now.