Cast Iron LS Exhaust Manifolds for 1953-1998 GM Chassis
When you retrofit an LS powerplant into a 1953 to 1998 GM chassis, exhaust manifold clearance and heat endurance become critical concerns. These Cast Iron Exhaust Manifolds are cast from silicon and molybdenum enriched ductile iron to resist cracking under repeated high temperature cycles while maintaining a tight tuck layout that fits narrow frame rails. Complete with OEM style gaskets, bolts and flanges, they bolt straight on to Chevrolet Corvettes, G Body coupes and GM trucks without altering steering components.
Robust Ductile Iron Construction for Heat Resilience
Cast from a silicon and molybdenum enriched ductile iron alloy, these exhaust manifolds excel at resisting cracking and warping under the repeated high temperature cycles typical of LS engine swaps. The unique alloy composition maintains structural integrity even when subjected to sustained heat, ensuring the runners hold their shape and sealing surfaces remain precise. This inherent toughness allows the manifolds to withstand street driving and track sessions without fatigue. The natural cast finish also provides a solid base for optional surface treatments, extending service life in corrosive environments.
Tight Tuck Layout Optimizes Clearance and Flow
The closely packed runner configuration positions the manifold against the block to maximize space in narrow engine bays found in classic GM cars and trucks. By maintaining a compact design, the clearance between frame rails and steering components is preserved without sacrificing exhaust capacity. A smooth internal passage leads to a 2.25 inch outlet that sustains exhaust velocity, improving scavenging and reducing backpressure. This balance of fitment and flow translates into more responsive torque across the rpm range.
Comprehensive Hardware Kit Simplifies Installation
Each set includes precision matched welding flanges, OEM style gaskets, bolts, studs, and all necessary hardware to ensure a straight-forward installation. Providing every component eliminates the risk of mismatched parts and the need for multiple orders, which saves time during assembly. The supplied gaskets and bolt patterns mirror factory dimensions for a reliable seal and proper alignment. Installers benefit from the plug-and-play nature of the kit on popular platforms like Corvette, G-Body and GM trucks.
Enhanced Exhaust Flow Supporting High Output
Engineered to handle power levels up to 500 horsepower, these manifolds improve catalytic converter performance by delivering stable temperatures and consistent flow. The maintained exhaust velocity promotes faster light-off of catalysts, reducing warm-up time and aiding emissions control. With minimized backpressure, engines breathe more freely, boosting both peak output and low end torque. The result is a more responsive throttle feel and dependable operation in high output LS applications.
A reliable choice for precise fit and consistent exhaust flow in your LS retrofit.