You may need to cut roughly 5/16” off the stock spark plug heat shields to ensure a proper fit.
Disconnect the battery and remove existing manifolds. Some applications may require dropping the starter to slide the passenger-side header into place. Fitting: Work headers up from below the chassis.
Use high-quality gaskets. While standard gaskets are included, some users recommend Remflex gaskets for better leak prevention. g9011.mp4
18-gauge steel with a temporary non-high temperature paint coating.
3.00 inches with 2.500-inch reducers included. You may need to cut roughly 5/16” off
According to the official Installation Instructions , the process generally requires the following steps:
These are long-tube, one-piece steel headers designed for high-performance exhaust flow in big-block Chevrolet engines. 1 3/4 inches. Fitting: Work headers up from below the chassis
Primarily fits 1968–1990 GM Truck 4x4 big-block applications. They are not officially intended for GMT400 trucks, as some users report clearance issues with 4WD systems. Installation Walkthrough & Technical Notes
