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FAST 301101 XFI Main Wiring Harness, GM LT1/Carb Conversion
FAST 301101 XFI Main Wiring Harness, GM LT1/Carb Conversion

FAST 301101 XFI Main Wiring Harness, GM LT1/Carb Conversion

LS1 Chevy LS V8, LS6 Chevy LS V8, 12 Number of Circuits, Column Ignition Key Location

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FAST 301101 XFI Main Wiring Harness, GM LT1/Carb Conversion
FAST 301101 XFI Main Wiring Harness, GM LT1/Carb Conversion
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We estimate this item will ship on or before December 14th.
Part # 282301101
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 3 business days for FAST Fuel Air Spark Technology to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


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GTIN Code:
MFG. Part #:
Number of Circuits:
Fuse Block Included:
Ignition Key Location:


FAST XFI Main Harnesses feature clearly labeled wires and pre-terminated ends with Weather Pack connectors for a perfect fit to your application. Environmentally sealed Weather Pack connectors were originally designed to be able to withstand exposure to extreme temperatures, moisture, and harsh engine compartment fluids and chemicals. They are heavily used by OEM Automobile/Truck, Construction, Off-Road, and Farm Equipment manufactures due to their high quality and excellent fitment.

Harness Part Number 301101

  • Harness will work w/ GM LT1 & LS Engines when the below sensors are used
  • Comes equipped to work w/ GM LT1-Style or LS1-Style TPS & IAC

Sensors for Part Number 301101 Harness

Throttle Position Sensor (TPS)

  • Part# 307028 - GM LT1 style Sensor
  • Part# 54020 - GM LS1 style Sensor

Manifold Absolute Pressure (MAP)

  • 1 Bar MAP (14.5psi Max) Part# 307007
  • 2 Bar MAP (29.0psi Max) Part# 307008
  • 3 Bar MAP (43.5psi Max) Part# 307009
  • 5 Bar MAP (72.5psi Max) Part# 307047

Coolant Temp. Sensor (CTS)

  • FAST Part# 307003

Air Temp. Sensor (ATS)

  • FAST Part# 307004

Idle Air Control (IAC)

  • LT1 - Part# 307015
  • LS1 - Part# 307059
Some parts are not legal for use in California or other states with similar laws/regulations

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Q & A

Videos & Articles
  • After installing the intake manifold and carbs on his 8BA, Heath P. continues on to the fuel and throttle setup. See how he mounts each part while making modifications to complete the install.
  • Do you have carbs sitting on the shelf waiting to be put on? Heath talks about the preparation and parts needed to install a set of Super 9-7 Carbs on his 1949 Flathead 8BA V8 Model A.
  • One of the most important parts of your racing operation is the engine. This article gives a detailed overview on how to maintain your engine to get the most out of it for as long as possible. Also learn some tips to prolong the life of your engine.

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