Exhaust Headers for Chevrolet GMC C/K Trucks (1988-1997) 5.0L 5.7L Engine

High-Flow T-304 Stainless Exhaust Headers for 1988-1997 GMC, Chevrolet C/K Trucks (GMT400/SBC)

What it Does: Replaces the restrictive, heavy cast-iron factory manifolds with mandrel-bent stainless steel tubing to maximize exhaust scavenging and reduce backpressure on 5.0L and 5.7L V8 engines.

The Stock GMT400 Flow Restriction

The factory exhaust manifolds on the 1988-1997 GMT400 platform are engineered for mass production rather than volumetric efficiency. These heavy cast-iron units utilize a cramped "log" design where exhaust pulses from neighboring cylinders often collide, creating significant backpressure and turbulence. Over decades of heat cycling, these cast components are notorious for developing hairline fractures and warped mounting surfaces, leading to persistent exhaust leaks and lost vacuum. Furthermore, the internal casting flash and rough transitions trap excessive heat near the cylinder heads, which increases exhaust gas temperatures (EGTs) and stifles the low-end torque necessary for heavy-duty towing and acceleration.

The Engineering Solution

These headers are engineered to eliminate those bottlenecks using 1.75-inch primary tubes constructed from high-grade T-304 stainless steel. This material offers superior thermal stability and corrosion resistance compared to mild steel alternatives. The CNC mandrel-bending process ensures a constant internal diameter through every curve, promoting smooth laminar flow and allowing the engine to breathe more freely. The 7/16-inch thick head flanges provide a rigid, warp-resistant mounting surface that maintains a consistent seal under extreme thermal stress. Featuring an 8-2 lightweight design on the driver side and a 3-bolt ball socket collector, these headers facilitate improved exhaust velocity and scavenging, effectively pulling spent gases out of the combustion chamber to allow for a cleaner intake charge.

Technical Specifications

Compatibility

• 1988-1997 Chevrolet C1500 / K1500 (5.0L, 5.7L V8)
• 1988-1997 Chevrolet C2500 / K2500 (5.0L, 5.7L V8)
• 1988-1997 Chevrolet C3500 / K3500 (5.7L V8)
• 1988-1997 GMC C1500 / K1500 (5.0L, 5.7L V8)
• 1988-1997 GMC C2500 / K2500 (5.0L, 5.7L V8)
• 1988-1997 GMC C3500 / K3500 (5.7L V8)
• Note: Fits models without Air Injection only.

The GMC, Chevrolet Truck Standard

Designed for the rigors of American truck ownership, these headers focus on long-term durability and torque recovery. Whether you are refreshing a TBI workhorse or a Vortec-powered daily driver, the T-304 stainless construction ensures your exhaust system survives heavy towing cycles and harsh road conditions without the fatigue failure common in factory cast units.