MSD 8621 Flying Magnet Crank Trigger Replacement Wheel Big Block Chevy 8 in. Red Anodized

The MSD 8621 is a replacement 8-inch Flying Magnet crank trigger wheel designed for use with the MSD Flying Magnet Crank Trigger Kit (p/n 8620) on Big Block Chevy applications. This wheel is the most accurate way to trigger your ignition by delivering consistent, reliable crank position signals directly from the crankshaft.

MSD's Flying Magnet design uses four powerful magnets embedded in a billet aluminum trigger wheel that pass by a stationary non-magnetic pickup to fire the ignition. Unlike traditional crank trigger systems that use steel studs and a magnetic pickup — which can be falsely triggered by stray bolts, debris, or engine vibrations — the non-magnetic pickup used with this wheel cannot be false triggered, eliminating potentially damaging misfires.

Key Features:

• Replacement trigger wheel for MSD Flying Magnet Crank Trigger Kit (p/n 8620)
• 8-inch diameter — sized for Big Block Chevy harmonic damper applications
• Four powerful magnets embedded in CNC-machined billet aluminum construction
• Red anodized finish for corrosion resistance and easy identification
• Compatible with MSD 6, 7, and 8 Series ignitions and all MSD timing accessories
• Non-magnetic pickup design eliminates false triggering from debris or vibration
• Racing use only — not legal for use on emissions-controlled vehicles

The MSD 8621 is sold individually and includes four magnets and mounting instructions. It is the direct replacement wheel for racers who need to refresh their existing MSD Flying Magnet crank trigger system without purchasing a complete kit.