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![Crank Trigger Wheel for SB & BB Chevy [Black Anodized]](https://www.jegs.com/images/mini_750/500/510/510-556-109.jpg)
Vehicle Info NeededHOLLEYPART NUMBER: 510-556-109
Crank Trigger Wheel for SB & BB Chevy [Black Anodized]
$7799
Ships on 09/10/2026
Lowest Price GuaranteeCrank Trigger Wheels
Crank Trigger WheelSmall Block & Big Block Chevy Engines Diameter: 8.5 in. 60 Notches plus One TDC Double Notch Center Bore: 1 in. Steel, Black Anodized
The Crank Trigger Wheel provides an accurate crankshaft speed signal for a Holley EFI system, with a notched outer edge read by a crank sensor for stable timing at high rpm.
Holley 556-109 Features:
- Bolt hole pattern machined for small block and big block Chevy engines.
- 8.5 in. diameter.
- 60 notches plus one TDC double notch.
- 1 in. diameter center hole, may require machining for the application.
- Steel with black anodized finish.
- Trigger an Accurate EFI Signal!
Holley Crank Trigger components are manufactured from high quality materials for strength & durability. These systems are designed to provide an engine speed signal specifically to Holley EFI systems only. The crank trigger wheel will provide a very accurate crankshaft speed signal to the ECU. These systems come with the hardware, sensor, and wiring necessary for installation.
NOTE: It will be necessary to move any engine accessories about 1/8" to accommodate the spacing the trigger wheel adds.Part TypeIgnition Crank Trigger Wheel
Product LineHolley Crank Trigger
BrandHOLLEY
Package Height0.8
Package Width10.1
Package Length10.6
Weight1.83 PG
Part CategoryPerformance Parts
Hardware IncludedNo
QuantitySold individually
MaterialSteel
Part FitmentUniversal
Vendor Part Number556-109
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
