*Fit for 1966-1987 small block Chevy and GM/GMC C/K Series 1500 2500 3500 Pickup Truck,Suburban and Blazer
*The thickness of flanges is 1/4"(measured from weld seal spot is 3/8"), and the collectors are 3"
*Package include headers, bolts, exhaust gaskets, collector gaskets, and all necessary bolts.