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Long Tube Headers for 64-77 GM F/A Body 396-502 BBC 1-3/4in Primary D313-B EditPics 6L V6 2012-2014 Dodge ChargerOverview: 64 77 GM F & A Body BBC Long Tube Black Long tube headers provide the greatest increases in horsepower and torque across the entire RPM spectrum. The choice of racers worldwide, Doug's long tube headers are designed for the car owner who wants maximum power and the highest quality header on the market. This fitment is tailored for popular aftermarket engine swap kits. Doug's engine swap headers were developed to solve common fitment issues