Exhaust Header Fit For Chevy Chevrolet Buick 4.8L 5.3L LS1 LS2 LS3 LS6 LS 1-3/4 MT001096 72338305Features Pipe Thickness: 16 gauge (1. 5mm) Primary Diameter: 1 3 4" (45mm) Collector Diameter: 3" (76mm) Head Flange Thickness 3 8" (9. 5mm) Mandrel Bent Tubing Merge Spikes V8 Engines Only 4. 8L, 5. 3L, 5. 7L, 6. 0L, 6. 2L Engines Fitment 1964 1973 Chevrolet Chevelle 1964 1967 Chevrolet El Camino 1970 1977 Chevrolet Monte Carlo 1964 1977 Pontiac Lemans 1964 1972 Pontiac GTO 1964 1977 Oldsmobile Cutlass 1964 1971 Buick Skylark