LS Exhaust Manifolds for 1953-1998 GM Classic Cars and Trucks
If you're retrofitting an LS or LT engine into a classic Chevrolet chassis from 1953 to 1998, you need reliable performance in confined bays and resistance to corrosive road conditions. These exhaust manifolds address those demands with durable hi silicon moly ductile iron construction, natural cast finish and an optional ceramic coating for lasting corrosion resistance. They support up to 500 horsepower and feature a tight tuck profile to clear frame rails. Vehicle fitment includes 1953-1982 Chevrolet Corvette, 1977-1995 Chevrolet G Series Van, 1955-1957 Chevrolet passenger cars, 1978-1988 GM G Body, 1963-1972 GM Trucks, 1973-1987 GM Trucks, 1988-1998 GM Trucks, 1964-1972 GM A Body, 1973-1977 GM A Body, 1958-1964 GM B Body, 1965-1970 GM B Body, 1977-1990 GM B Body, 1991-1996 GM B Body, 1970-1981 GM F Body, and 1971-1980 Chevrolet Vega/Monza.
Material Composition and Durability
These exhaust manifolds are cast from a ductile iron alloy enriched with silicon and molybdenum to resist cracking under extreme heat cycles. The natural cast finish offers solid corrosion resistance, while the optional ceramic coating further shields the metal from moisture and road salt. Thanks to the wall thickness of the primary tubes and robust collector design, users can expect prolonged service life even when running repeated high-load shifts or long-duration cruises.
Optimized Flow Dynamics and Converter Efficiency
Featuring a tight tuck routing, each primary tube bends close to the frame rails without sacrificing ground clearance, promoting a compact profile under the vehicle. Primaries merge into a 2.25 inch outlet collector sized to maintain exhaust velocity, which helps improve scavenging and reduce back pressure. This configuration is tuned to boost catalytic converter performance by delivering a more uniform gas pulse, and it has been validated to handle up to 500 hp with consistent response and minimal heat soak into adjacent components.
Vehicle Integration and Mounting Precision
Engineered for LS series engines, these exhaust manifolds retain stock bolt patterns for the block and flange locations across all supported 1953-1998 GM Classic Cars and Trucks. When paired with MuscleRods engine mounts and bracket kit, installation ensures the crankshaft centerline remains true and the driveline angle stays within factory tolerances. This synergy between components delivers straightforward fitment and prevents interference with steering linkages or suspension arms.
Built from hi silicon moly ductile iron with optional ceramic coating and rated for up to 500 hp, these exhaust manifolds arrive with left and right manifolds, welding flanges for leak free connection to exhaust tubing, OEM style gaskets, and bolts, studs and installation hardware for a complete LS retrofit.