For 1966 to 1996 Chevy Small Block V8 4 -1 Design 2pcs Stainless Steel Exhaust Header Kit 83 84 85 86 87 88 89 90 91 92 93 94 95Category: Borla Stainless HeadersThe exhaust manifolds found in the 1966-1996 Small Block Chevy engines were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 Block Hugger off-road headers are designed to allow the exhaust gasses to flow more freely from each cylinder bank and combine in a more efficient manner. Block Hugger style headers are meant to be used where space for long tube headers is not available due to steering and cross member clearance issues. Tubing has been optimized for the 5.0L(305ci), 5.3L(327ci), 5.7L(350ci), and 6.6L(400ci) engines. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.Please note these Block Hugger Headers are a semi universal header. The application guide attached is for reference of the engines these headers will fit. The headers are not direct fit to any factory y-pipe. Exhaust fabrication will be required when installing these headers on your vehicle.Specification:Made From High Quality T304 Stainless Steel For Strength & DurabilityConstructed With TIG Welded CNC Machine FlangeAll Tubing Is Mandrel-BentComes With Reducer and Metal GasketNote: Headers are Semi Universal for Small Block V8 Engine (Compatibility Chart is for Reference Only)Package Included:1 x Set of Header Exhaust System, Gasket(s) and Bolt(s)(ALL if any is necessary for Installation)Fitment:ALL Small Block Chevy V8 Engines from '55+ using the Standard Exhaust Pattern - 283, 305, 327, 350, 400,... etc.