Painted Long Tube HeadersSmall Block Chevy 283-400 ciFits Select 1967-1992 GM 2WD and 4WD Trucks1.500 in. O.D. Primary Tubes3 in. O.D. Collectors2.500 in. O.D ReducersPair JEGS 555-30055 Long Tube Headers Features: 1-1/2 in. mandrel bent and fully tig welded primary tubes 5/16 in. flanges for a leak-free seal 3 in. collectors Black painted finish for great looks and long life Includes gaskets, reducers, & hardware to complete your project For cylinder heads with straight spark plug design onlyJEGS 555-30055 Long Tube Headers Notes: Customers must modify stock exhaust to retain catalytic converter(s) Applications with oxygen sensors will.