Looking for a clean, durable, budget-friendly exhaust solution for your LS swap? Speed Engineering's black cast iron LS swap exhaust manifolds deliver solid flow improvement over stock, with less valve noise than traditional shorty or longtube headers and a tight tuck design that provides a clean, traditional muscle car appearance across most popular classic GM chassis.
The 2.25" outlet diameter improves flow compared to most factory cast iron manifolds, and the 2-bolt exit flange matches E-rod exhaust manifolds for a factory-like fitment — allowing the use of factory gaskets and fasteners for an original quality seal if desired.
⚠️ Important Installation Notes:
- LS swap applications only — these manifolds are NOT compatible with standard SBC or BBC engines
- 1968–1974 Nova and 1968–1972 Chevelle early 60s applications require an aftermarket steering shaft
- 4L80E or older Turbo 350/400 transmission — bellhousing ears may need to be trimmed for proper clearance due to tight tuck design on narrow older frame clearance
Features:
- Cast Iron Construction — Durable, leak-resistant, and built for long-term LS swap applications
- Black Finish — Clean, traditional muscle car appearance
- 2.25" Outlet Diameter — Improved flow for maximum performance from a cast iron exhaust manifold
- 2-Bolt Exit Flange — Matches E-rod exhaust manifolds for factory-like fitment; compatible with factory gaskets and fasteners
- Tight Tuck Design — Universal fit for most popular chassis with a clean traditional appearance
- Less Valve Noise — Quieter operation compared to traditional shorty or longtube headers
- Compatible with GM LS Engine Swap Applications
- LS Engines Only
Vehicle Applications:
Note: All applications listed are LS swap conversions. These manifolds are not compatible with original factory SBC or BBC engines in these vehicles.
Chevrolet Camaro & Pontiac Firebird
- 1960s Chevrolet Camaro — LS Swap
- 1970s Chevrolet Camaro — LS Swap
- 1960s Pontiac Firebird — LS Swap
- 1970s Pontiac Firebird — LS Swap
Chevrolet Nova
- 1968 Chevrolet Nova — LS Swap
- 1969 Chevrolet Nova — LS Swap
- 1970 Chevrolet Nova — LS Swap
- 1971 Chevrolet Nova — LS Swap
- 1972 Chevrolet Nova — LS Swap
- 1973 Chevrolet Nova — LS Swap
- 1974 Chevrolet Nova — LS Swap
⚠️ Early 1960s Nova applications require an aftermarket steering shaft.
Chevrolet Chevelle
- 1968 Chevrolet Chevelle — LS Swap
- 1969 Chevrolet Chevelle — LS Swap
- 1970 Chevrolet Chevelle — LS Swap
- 1971 Chevrolet Chevelle — LS Swap
- 1972 Chevrolet Chevelle — LS Swap
⚠️ Early 1960s Chevelle applications require an aftermarket steering shaft.
Chevrolet & GMC C10/K10 Pickups & Panels
- 1960–1987 Chevrolet C10/K10 Pickups & Panels — LS Swap
- 1960–1987 GMC C10/K10 Pickups & Panels — LS Swap
Chevrolet & GMC OBS C1500/K1500
- 1989 Chevrolet C1500/K1500 — LS Swap
- 1990 Chevrolet C1500/K1500 — LS Swap
- 1991 Chevrolet C1500/K1500 — LS Swap
- 1992 Chevrolet C1500/K1500 — LS Swap
- 1993 Chevrolet C1500/K1500 — LS Swap
- 1994 Chevrolet C1500/K1500 — LS Swap
- 1995 Chevrolet C1500/K1500 — LS Swap
- 1996 Chevrolet C1500/K1500 — LS Swap
- 1997 Chevrolet C1500/K1500 — LS Swap
- 1998 Chevrolet C1500/K1500 — LS Swap
- 1999 Chevrolet C1500/K1500 — LS Swap
- 1989 GMC C1500/K1500 — LS Swap
- 1990 GMC C1500/K1500 — LS Swap
- 1991 GMC C1500/K1500 — LS Swap
- 1992 GMC C1500/K1500 — LS Swap
- 1993 GMC C1500/K1500 — LS Swap
- 1994 GMC C1500/K1500 — LS Swap
- 1995 GMC C1500/K1500 — LS Swap
- 1996 GMC C1500/K1500 — LS Swap
- 1997 GMC C1500/K1500 — LS Swap
- 1998 GMC C1500/K1500 — LS Swap
- 1999 GMC C1500/K1500 — LS Swap
Frequently Asked Questions:
Q: What is the difference between these exhaust manifolds and longtube headers for an LS swap? These cast iron exhaust manifolds offer a tighter tuck design with less valve noise and a more factory-like appearance compared to longtube headers. Longtube headers generally provide greater horsepower gains at higher RPM, while these manifolds are a better fit for builds prioritizing a clean look, quieter operation, and easy fitment across a wide range of chassis.
Q: Will these work with my SBC or BBC engine? No. These manifolds are designed for LS series engine swaps only and are not compatible with standard small block Chevy or big block Chevy engines.
Q: Do early 1960s Nova and Chevelle applications require any additional parts? Yes. Early 1960s Nova and Chevelle applications require an aftermarket steering shaft for proper fitment.
Q: Will these fit with a 4L80E or older Turbo 350/400 transmission? These manifolds may require trimming of the bellhousing ears on 4L80E or older Turbo 350/400 transmissions for proper clearance due to the tight tuck design.
Q: What is the outlet diameter on these manifolds? The outlet diameter is 2.25 inches, providing improved flow over most factory cast iron manifolds.
Q: What flange configuration do these manifolds use? These manifolds use a 2-bolt exit flange that matches E-rod exhaust manifolds, allowing the use of factory gaskets and fasteners for an original quality seal and fitment.
Q: Are these manifolds street legal? No. These are race-only products intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).
