This MSD Flying Magnet crank trigger kit uses four magnets embedded in an aluminum wheel and a non-magnetic pickup to deliver a stable, accurate ignition trigger signal for Ford small block Windsor engines (289/302/351W). It includes a two-piece mounting bracket with spacers for standard motor mounts or a .25 in. motor plate, and triggers MSD 6, 7, and 8 Series ignitions along with MSD timing accessories.Specifications: Fitment: Ford SBF Windsor, 289/302/351W Diameter: 6.562 in. Color: Red Sensor Type: Magnetic Trigger Type: 4X Sensor Dimensions: 3/4 x 2.25 in. Wheel Width: 3/8 in. Warranty: Manufacturer's Limited 1 Year Warranty Part Number: 8640 Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).FAQWhat engines does the MSD 8640 crank trigger kit fit?It's designed for Ford small block Windsor engines, 289/302/351W.What ignitions does this kit trigger?MSD 6, 7, and 8 Series ignitions, as well as MSD timing accessories.What's the trigger wheel diameter?6.562 inches.Is the MSD 8640 legal for street use?No. It is coded for Racing Use Only and cannot be installed on an emissions-controlled street vehicle.{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What engines does the MSD 8640 crank trigger kit fit?","acceptedAnswer":{"@type":"Answer","text":"It's designed for Ford small block Windsor engines, 289/302/351W."}},{"@type":"Question","name":"What ignitions does this kit trigger?","acceptedAnswer":{"@type":"Answer","text":"MSD 6, 7, and 8 Series ignitions, as well as MSD timing accessories."}},{"@type":"Question","name":"What's the trigger wheel diameter?","acceptedAnswer":{"@type":"Answer","text":"6.562 inches."}},{"@type":"Question","name":"Is the MSD 8640 legal for street use?","acceptedAnswer":{"@type":"Answer","text":"No. It is coded for Racing Use Only and cannot be installed on an emissions-controlled street vehicle."}}]}
