LS Swap 1 5/8" Shorty Headers S10 & S10 Blazer | 1982-2004 (LS1, LS2, LS3, LS6, LSA) — Manufacturer part number: 25-1039.

(In Stock)

Speed Engineering LS swap shorty headers are made out of 304 stainless steel and offer great quality, performance, and affordability. Our LS swap shorty headers are mandrel bent, tig welded, and feature natural stainless steel construction. All of our LS swap shorty headers have been dyno proven. We stand behind our LS swap shorty headers in saying you will not find a better fitting, quality built, budget header for your vehicle.

"Our LS swap shorty headers also have improved features over competitors. We utilize V-Band collector construction, merge spikes, port matched flanges, and improved header to block/chassis clearance".

Features include:

• Mandrel Bent Tubing
• Full 1 5/8" Primaries
• 2 1/2" Collector
• Shorty Header Design
• LS Swap Conversion Header
• V-Band Collector Construction
  
• Collector Merge Spikes
  
• Port Matched Flanges
  
• Gains over 18+ rwhp
  
• V8 Engines Only
• 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, LSA Engines
• CNC Machined Flanges
• Natural 304 Stainless Steel
• Standard Graphite Manifold Gaskets

Note: "For LS series engine swaps only" These do not work on standard SBC or BBC.

Note: Our spark plug wires, or a similar designed spark plug wire will be needed for proper clearance.

Note: If using a larger 4L80E or older Turbo 350/400 transmission the bellhousing ears may need to be trimmed for proper clearance. Our headers are tucked in tight due to narrow older frame clearance.

Note: Will not work on 4x4 applications.

Note: Collector might need modification to work with aftermarket oil pans.

Vehicle Applications:

• 1982-2004 Chevrolet S10 Truck
• 1982-2004 GMC Sonoma Truck
• 1982-2005 Chevrolet S10 Blazer
• 1982-2005 GMC Jimmy
• 1991-2001 Oldsmobile Bravada

Disclaimer: Universal weld-in catalytic converters will require fabrication for installation on our exhaust products. 

(Warning) This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability.

Fitment and ordering

Confirm the vehicle, engine, dimensions and application restrictions listed above before ordering. Speed Engineering parts are designed to work with Speed Engineering components; mixing brands may require modifications.

Available upgrades and related Speed Engineering parts

Use the selectors above to include upgrades with this product. The links below are for reference or separate purchases; do not also buy an upgrade separately if you have already selected it above. Check quantities, included parts, and fitment.

• LS Multi-Layer Steel Gaskets
• Standard Zinc Bolts - LS
• "RED" 10" Total Length Wires
• "RED" 12" Total Length Wires
• "BLACK" 10" Total Length Wires
• "BLACK" 12" Total Length Wires
• Upgraded HD V Band Clamps
• Spark Plug Wire Fire Sleeves

Manufacturer specifications and availability checked October 4, 2026. Availability refers to the manufacturer and can change; it does not indicate stock held at Speedzone.

Returns: All Speed Engineering product sales are final. No returns are accepted on Speed Engineering products. Please verify fitment before ordering. See our Return Policy for additional terms. This does not limit any consumer rights that cannot be waived under applicable law.