The 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 isn’t 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.
Professional Installation is Highly Recommended
Installation Instruction is not Included
Inlet Outlet: 1.5" 2.5"
Reducer and Metal Gasket Included
TIG Welded CNC Machine Flange
Add Instant Horsepower (10-15 hp).
1 Set Header Exhaust System, Gaskets and Bolts as shown in Picture
Fits All Small Block Chevy V8 Engines from '55+ using the Standard Exhaust Pattern - 283, 305, 327, 350, 400 etc. (except 1971 Chevrolet Nova,1972 Chevrolet Caprice?1983 Chevrolet Caprice Classic Sedan 4-Door 5.0L,1984 Buick Regal ,1986 Chevrolet Caprice 5.7,1987 Chevrolet Caprice,1978 Chevrolet corvette?1973 Chevrolet Nova Base 5.7L 350)
For Year and Model, Please Check Compatibility