Description:
- 100% Brand New, Never Been Tried Or Installed.
- Header Inlet / Outlet Size (IN): 1.75" / 3.5"
- 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
- 4-1 High Performance Racing Spec. Design
- TIG Welded CNC Machined Flange
- O2 Sensor Bung Insertion And Metal Gasket Included
- Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq.
- Instruction Is Not Included.
- Professional Installation Is Highly Recommended.
Package Including:
- 1 x Set Of Exhaust Header
- All Necessary Hardware, Bolts, And Gaskets As Pictures Show
Fitment:
- Fits Small Block Chevy Motors Only. Will Not Fit Big Block Equipped Vehicles
- For Year And Model, Please Check Compatibility
NOTE:The Exhaust Manifolds Found On The 1965-1974 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 Long Tube Style 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 Small Block 283/302/305/307/327/350/400 Cubic Inch 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.