Features 3-Bolt Flange Inlet/ Outlet: 1.5"/ 2.5" Primary Diameter: 1-1/2 in. Collector Diameter: 2-1/2 in. Head Flange Thickness：3/8 in. (9.5mm) Pipe Thickness: 16 gauge (1.5mm) TIG Welded CNC Machine Flange Fitment Fits All Small Block Chevy V8 Engines from '55+ using the Standard Exhaust Pattern - 283, 305, 327, 350, 400 etc. Doesn't fit 1971 Chevrolet Nova Doesn't fit 1972 Chevrolet Caprice Doesn't fit 1983 Chevrolet Caprice Classic Sedan 4-Door 5.0L Doesn't fit 1984 Buick Regal Doesn't fit 1986 Chevrolet Caprice 5.7 Doesn't fit 1987 Chevrolet Caprice Doesn't fit 1978 Chevrolet Corvette Doesn't fit 1973 Chevrolet Nova Base 5.7L 350

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