Swap Long Tube Headers 1-7/8. Application: compatible with LS motor swap on 60-98 Chevy/GMC trucks (2WD) LS based engines LS1, LS2, LS3, LS6, LS7, etc. (48mm) Collector Diameter: 3 in. (76mm) Head Flange Thickness:3/8 in. (9.5mm) Pipe Thickness: 16 gauge (1.5mm) Material: 304 Stainless Steel Finish: Polished. Please contact sellers for details.