LS1 to LS3 MAP Sensor Adapter Harness — Manufacturer part number: 31-1027.

(OUT OF STOCK ETA 9/30)

LS1 to LS3 MAP Sensor Adapter Harness. This harness will allow you to use an LS3 style MAP sensor with an LS1 or Truck factory harness for installation. Also works with Holley Hi Ram that uses provisions for bolting on the LS3 MAP sensor.

Features include:

• Factory harness plug in
  
• Adapts OEM Gen 3 wire harness to LS3 Gen 4 (Bosch Style) MAP sensor
  
• 24" Length

(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.

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