What is Crank Trigger Ignition (Pulleys)?
What is crank trigger ignition?
A crank trigger uses magnets and/or spokes around your crankshaft that provide highly accurate ignition triggering for high end engines.
When is a crank trigger required?
A crank trigger is never a requirement but is typically used for high RPM (7000+), high compression, forced induction, and nitrous applications.
Does a crank trigger effect my engine?
Crank triggers are typically 3/8" thick which can throw off your belt alignment. CVF has specific pulleys designed for crank triggers on our Big and Small Block Chevy Kits. Make sure to select this option when purchasing your kit!
How can I tell if I have a crank trigger?
No engines came stock with a crank trigger, but your engine may have come with one if you purchased it secondhand or as a crate motor. Both the spoke and magnet designs are identifiable by an additional bracket near your crankshaft. There will also be an additional spacer/wheel on your balancer.

Does CVF sell crank triggers?
CVF does not manufacture or sell crank triggers. MSD is the industry leader in crank triggers and can be found from various suppliers.
Recent Posts
-
Chevy LS Intake Manifold Clearance Issues: How to Fix Them
Swapping in a large performance intake manifold — like the Fast 102mm — on a Chevy LS engine is a po …Mar 3rd 2026 -
What is VVT and Do I Have It? (Chevy LS Guide)
If you're building or swapping a Chevy LS engine, one of the first things you need to determine is w …Feb 25th 2026 -
Hot Rod Bio: 1,500 Horsepower on pump gas - Anthony’s ProCharged 1970 Chevelle
At SEMA 2025 we caught up with Anthony and his 1970 Chevelle that makes a very casual 1,500 horsepo …Jan 23rd 2026