Looking to drop a modern LS engine into your 1965–1970 B-body? Speed Engineering's 1-7/8" LS swap longtube headers are built specifically for these full-size GM platforms — mandrel bent, TIG-welded, and CNC-machined for a precise fit on Impala, Caprice, Bel Air, and Biscayne LS conversion builds. Compatible with the full LS engine family from 4.8L through 6.2L including LS1, LS2, LS3, LS6, and LSA. Dyno proven to deliver over 25 rear-wheel horsepower over stock manifolds.
Built from 304 natural stainless steel with port-matched primaries and standard graphite manifold gaskets included.
⚠️ Important Installation Notes:
- LS swap applications only — these headers are NOT compatible with standard SBC or BBC engines
- 4L80E or older Turbo 350/400 transmission — bellhousing ears may need to be trimmed for proper clearance
Features:
- Full 1-7/8" Port-Matched Primary Tubes — 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
- Standard Graphite Manifold Gaskets Included
- Dyno Proven — 25+ RWHP gain on LS applications
- Compatible with 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, and LSA Engines
- V8 Engines Only
Vehicle Applications:
Note: All applications listed are LS swap conversions. These headers are not compatible with the original factory engines in these vehicles.
Chevrolet Bel Air — B-Body (RWD)
- 1965 Chevrolet Bel Air (RWD) — LS Swap
- 1966 Chevrolet Bel Air (RWD) — LS Swap
- 1967 Chevrolet Bel Air (RWD) — LS Swap
- 1968 Chevrolet Bel Air (RWD) — LS Swap
- 1969 Chevrolet Bel Air (RWD) — LS Swap
- 1970 Chevrolet Bel Air (RWD) — LS Swap
Chevrolet Biscayne — B-Body (RWD)
- 1965 Chevrolet Biscayne (RWD) — LS Swap
- 1966 Chevrolet Biscayne (RWD) — LS Swap
- 1967 Chevrolet Biscayne (RWD) — LS Swap
- 1968 Chevrolet Biscayne (RWD) — LS Swap
- 1969 Chevrolet Biscayne (RWD) — LS Swap
- 1970 Chevrolet Biscayne (RWD) — LS Swap
Chevrolet Caprice — B-Body (RWD)
- 1966 Chevrolet Caprice (RWD) — LS Swap
- 1967 Chevrolet Caprice (RWD) — LS Swap
- 1968 Chevrolet Caprice (RWD) — LS Swap
- 1969 Chevrolet Caprice (RWD) — LS Swap
- 1970 Chevrolet Caprice (RWD) — LS Swap
Chevrolet Impala — B-Body (RWD)
- 1965 Chevrolet Impala (RWD) — LS Swap
- 1966 Chevrolet Impala (RWD) — LS Swap
- 1967 Chevrolet Impala (RWD) — LS Swap
- 1968 Chevrolet Impala (RWD) — LS Swap
- 1969 Chevrolet Impala (RWD) — LS Swap
- 1970 Chevrolet Impala (RWD) — LS Swap
FAQ
Will these headers work with my SBC or BBC engine?
No. These headers are designed for LS series engine swaps only and are not compatible with standard small block Chevy or big block Chevy engines.
How much horsepower do these headers add?
Speed Engineering's 1-7/8" LS swap longtube headers are dyno proven to add over 25 rear-wheel horsepower compared to stock exhaust manifolds on LS applications.
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 LS engines are these headers compatible with?
These headers are compatible with GM LS V8 engines including 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, and LSA.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction and CNC-machined flanges.
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).
