Dropping a Gen V LT engine into your G-body? Speed Engineering's 1-7/8" LT swap longtube headers are engineered specifically for great fitment on the G-body platform — mandrel bent, TIG-welded, and CNC-machined for a precise fit on Monte Carlo, El Camino, Grand Prix, Cutlass, and Regal LT swap builds. Compatible with 5.3L and 6.2L LT1 and LT4 engines. Dyno proven to deliver over 25 rear-wheel horsepower over stock manifolds.
Built from 304 natural stainless steel with merge spikes and standard graphite manifold gaskets included.
⚠️ Important Installation Notes:
- Gen V LT direct injection engine swaps only — these headers are NOT compatible with SBC or BBC engines
- Due to older vehicle frame clearance, headers fit very tight and require Speed Engineering LT spark plug wires
- Adjustable motor mounts with 1" offset back are required for proper fitment
- 4L80E or older Turbo 350/400 transmission — bellhousing ears may need to be trimmed for proper clearance
Features:
- 1-7/8" Primary Tubes with Merge Spikes — Full-diameter flow from cylinder head to collector for maximum exhaust scavenging
- 3" Collector — Optimized for strong low-to-mid RPM torque
- Mandrel Bent Tubing — Consistent tube diameter through every bend; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the cylinder head for a leak-free seal
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Longtube Header Design — Maximum scavenging efficiency vs. shorty or mid-length headers
- Engineered for Great Fitment on the G-Body Platform
- Standard Graphite Manifold Gaskets Included
- Dyno Proven — 25+ RWHP gain on LT applications
- Compatible with 5.3L, 6.2L, LT1, and LT4 Engines
- V8 LT Engines Only
Vehicle Applications:
Note: All applications listed are Gen V LT swap conversions. These headers are not compatible with the original factory engines in these vehicles.
Chevrolet Monte Carlo — G-Body (RWD)
- 1982 Chevrolet Monte Carlo (RWD) — LT Swap
- 1983 Chevrolet Monte Carlo (RWD) — LT Swap
- 1984 Chevrolet Monte Carlo (RWD) — LT Swap
- 1985 Chevrolet Monte Carlo (RWD) — LT Swap
- 1986 Chevrolet Monte Carlo (RWD) — LT Swap
- 1987 Chevrolet Monte Carlo (RWD) — LT Swap
- 1988 Chevrolet Monte Carlo (RWD) — LT Swap
Chevrolet El Camino — G-Body (RWD)
- 1982 Chevrolet El Camino (RWD) — LT Swap
- 1983 Chevrolet El Camino (RWD) — LT Swap
- 1984 Chevrolet El Camino (RWD) — LT Swap
- 1985 Chevrolet El Camino (RWD) — LT Swap
- 1986 Chevrolet El Camino (RWD) — LT Swap
- 1987 Chevrolet El Camino (RWD) — LT Swap
Pontiac Grand Prix — G-Body (RWD)
- 1982 Pontiac Grand Prix (RWD) — LT Swap
- 1983 Pontiac Grand Prix (RWD) — LT Swap
- 1984 Pontiac Grand Prix (RWD) — LT Swap
- 1985 Pontiac Grand Prix (RWD) — LT Swap
- 1986 Pontiac Grand Prix (RWD) — LT Swap
- 1987 Pontiac Grand Prix (RWD) — LT Swap
Oldsmobile Cutlass — G-Body (RWD)
- 1982 Oldsmobile Cutlass (RWD) — LT Swap
- 1983 Oldsmobile Cutlass (RWD) — LT Swap
- 1984 Oldsmobile Cutlass (RWD) — LT Swap
- 1985 Oldsmobile Cutlass (RWD) — LT Swap
- 1986 Oldsmobile Cutlass (RWD) — LT Swap
- 1987 Oldsmobile Cutlass (RWD) — LT Swap
Buick Regal — G-Body (RWD)
- 1982 Buick Regal (RWD) — LT Swap
- 1983 Buick Regal (RWD) — LT Swap
- 1984 Buick Regal (RWD) — LT Swap
- 1985 Buick Regal (RWD) — LT Swap
- 1986 Buick Regal (RWD) — LT Swap
- 1987 Buick Regal (RWD) — LT Swap
- 1988 Buick Regal (RWD) — LT Swap
FAQ
Will these headers work with my SBC or BBC engine?
No. These headers are designed for Gen V LT direct injection engine swaps only and are not compatible with standard small block Chevy or big block Chevy engines.
Do I need special spark plug wires?
Yes. Due to tight frame clearance on older G-body platforms, Speed Engineering LT spark plug wires are required for proper fitment with these headers.
Do I need special motor mounts?
Yes. Adjustable motor mounts with a 1" offset back are required for proper fitment with these headers.
Will these fit with a 4L80E or older Turbo 350/400 transmission?
These headers may require trimming of the bellhousing ears on 4L80E or older Turbo 350/400 transmissions for proper clearance.
What engines are these headers compatible with?
These headers are compatible with Gen V LT V8 engines including 5.3L, 6.2L, LT1, and LT4.
What G-body vehicles do these headers fit?
These headers fit 1982–1988 Chevrolet Monte Carlo, 1982–1987 Chevrolet El Camino, 1982–1987 Pontiac Grand Prix, 1982–1987 Oldsmobile Cutlass, and 1982–1988 Buick Regal.
How much horsepower do these headers add?
Speed Engineering's 1-7/8" LT swap longtube headers are dyno proven to add over 25 rear-wheel horsepower compared to stock exhaust manifolds on LT applications.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and merge spikes.
Are gaskets included?
Yes. Standard graphite manifold gaskets are included with the headers.
Are these headers street legal?
No. These are race-only headers 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).
