This exhaust manifolds for the 1967-1977 Chevrolet Small Block Pickups were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our long tube 4-1 off-road headers are designed to allow the exhaust gasses to flow more freely from each 4 cylinder bank and combine in a more efficient manner. Tubing has been optimized for the 5.0L(305), 5.7L(350ci) and 6.6(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.

Specifics and Features:

Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability

i.e. Maximizing Smoothest High Exhaust Air Flow Rate

TIG Welded CNC Machine Flange

2-Piece 4-1 Racing Specs Design (8-2-1)

TIG Welded CNC Machine Flange

Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq.

1.25" Inlet, 3.00" Outlet

Bolts and Metal Gasket Included

Includes:

1 x Stainless Steel Header Exhaust