Compatible with 1979-1993 Mustang® 351W Engine Swap. This product is not created or sold by Ford®.; Put a 351W Based Engine in Your Fox BBK 1986-1993 351W swap Full length headers have been designed specifically for any enthusiast who wishes to swap out the smaller 302 block for a larger/ taller 351W block based engine. They feature 1-3/4 primaries for maximum performance with 351W or large displacement stroker engines. These full length headers will help give your large displacement 351W a throaty exhaust note. The durable ceramic coated finish holds in heat for more power and reduced underhood temperatures. Quality Construction BBK full length headers are made from 1-3/4 CNC-machined mandrel bent tubing with 3/8 thick die-stamped flanges. The full length primary tube design creates unrestricted and balanced airflow for ultimate horsepower gains. These headers are pressure tested to ensure leak free performance. Installation BBK long tube headers are designed as a direct bolt on with use of a BBK Performance short mid pipe. Kit includes new gaskets and hardware.;