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Holley

Holley EFI Crank Trigger Kits 556-171 Triggers, EFI, 7 in. Diameter, Aluminum, Silver, Adjustable Bracket, Black, 3-wire Pickup, 12-1X, Hall Effect, Chevy, Small Block, Kit

SKU: HLY556-171

Crank Trigger Kits
Holley EFI Crank Trigger Kits 556-171 Triggers, EFI, 7 in. Diameter, Aluminum, Silver, Adjustable Bracket, Black, 3-wire Pickup, 12-1X, Hall Effect, Chevy, Small Block, Kit

Holley

Holley EFI Crank Trigger Kits 556-171 Triggers, EFI, 7 in. Diameter, Aluminum, Silver, Adjustable Bracket, Black, 3-wire Pickup, 12-1X, Hall Effect, Chevy, Small Block, Kit

SKU: HLY556-171

Crank Trigger Kits
A$1,418.26
LOW STOCK! Est Ship 4-7 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.
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Description

Holley's EFI crank trigger kits provide accurate crank speed and position signals to Holley EFI systems in the most demanding, high-horsepower, racing applications. The crank position is measured every 10 degrees instead of every 45 degrees, like standard 4-magnet crank trigger systems. Holley's EFI crank trigger kits feature 1/4 in. thick, billet steel, 36-1 or 60-2 tooth-crank trigger wheels with black zinc oxide finish for superior corrosion resistance and striking good looks

Other notable features include:

* Crank wheels center off of balancer hubs, eliminating the need for centering rings
* All billet, 6061-T6 aluminum sensor mounting brackets with "bright-dipped" black anodized finish and laser-etched Holley EFI logo
* Custom 3-wire, ferrous-target, Hall-effect sensors with M12 x 1.0mm threads for finer gap adjustment
* Grade 8 and mil-spec mounting hardware

Part Type

7IN12-1X Crank Trigger Kit SBC Hall Effect

Data: v4.2 - Upd: 2026-10-13 18:48:02

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
556-171
Product Attributes - Part Type
Crank Trigger Kits
Product Attributes - Product Line
Holley EFI Crank Trigger Kits
Product Attributes - UPC
090127470657
Product Attributes - Pickup Included
Yes
Product Attributes - Adjustable Mounting Bracket Included
Yes
Product Attributes - Bracket Material
Aluminum
Product Attributes - Bracket Color
Black
Product Attributes - Crank Trigger Wheel Included
Yes
Product Attributes - Crankshaft Wheel Material
Aluminum
Product Attributes - Crankshaft Wheel Color
Natural
Product Attributes - Hardware Included
Yes
Product Attributes - Quantity
Sold as a kit.

Reference Information

Brand Name/s Holley
StreetFX SKU hly556-171
SFX Item ID 4782629
Supplier Item Code 4782629
Manufacturer SKU 556-171
Manufacturer UPC 90127470657
Alternative References HOL556-171, 3-wire, 12-1X

Compatibility

Application Data
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1955
    Ending Year1957
    Engine Size4.3L/265
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1957
    Ending Year1967
    Engine Size4.6L/283
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1962
    Ending Year1969
    Engine Size5.3L/327
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1964
    Ending Year1967
    Engine Size5.4L/327
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1967
    Ending Year1969
    Engine Size4.9L/302
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1967
    Ending Year2002
    Engine Size5.7L/350
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1968
    Ending Year1973
    Engine Size5.0L/307
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1980
    Engine Size6.6L/400
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1975
    Ending Year1976
    Engine Size4.3L/262
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1976
    Ending Year2002
    Engine Size5.0L/305
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1979
    Ending Year1982
    Engine Size4.4L/267
    Engine FamilyChevy small block Gen I
    Engine TypeV8
    Harmonic Damper Diameter (in.)7.000

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