EMPI 8544 CAST ALUM BREATHER KIT FOR HP VW ENGINES SAAND RAIL BUG BAJA PARTS Item description CHEVY LS HEADER FLANGES STAINLESS STEEL 1 7/8" PORTS 1/2"THICK. Pair of 1/2" thick with 1 7/8" ports, these stainless steel will not warp when welding.