Painted Long Tube HeadersBig Block Chevy 396-4541.750 in. O.D. Primary Tubes3 in. O.D.Collector to 2.500 in. O.D. Reducer JEGS 30059 Header Fitment 1968-1981 GM 1/2 & 3/4 Ton 4WD1968-1987 Blazer/Jimmy 2WD1973-1981 Blazer/Jimmy 4WD1973-1981 Suburban 4WD1973-1991 Suburban 2WDMust modify stock exhaust to retain catalytic converter(s). Applications with oxygen sensors will require the purchase of reducers with O2 fittings. These headers will not fit with A.I.R. pump. Must use original factory Big Block frame stands, motor mounts, and hardware. Works with vehicles equipped with A/C.AutomaticStandardColumnFloorColumnFloorYesYesNoNoReplacement Header Gasket #555-210151