4200 Performance Series

Built specifically for the GM Vortec 4200 inline-six platform, the Forever Fab 4200 Performance Series brings custom fabrication quality to a growing community of enthusiasts. Every manifold, flange, and hardware kit is designed and tested fit in-house for perfect fit, strength, and performance. Whether you’re boosting, swapping, or refining your 4200 setup, these parts deliver precision-engineered results backed by real-world experience.