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
3.00 inches with 2.500-inch reducers included. g9011.mp4
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. g9011.mp4
According to the official Installation Instructions , the process generally requires the following steps: g9011.mp4
Re-torque all bolts after a few days of driving to account for heat cycles. Common User "Write-Up" Findings
Use high-quality gaskets. While standard gaskets are included, some users recommend Remflex gaskets for better leak prevention.