The Race Proven Motors crank trigger kit for the 4.3L 90 Deg V6 is CNC machined out of 6061 aluminum with 3 rare earth magnets installed 120 deg apart for evenfire engines, and some oddfire applications.¬†¬† Our 7.250″ wheel produces an accurate signal that cannot be falsely triggered by other moving parts. The two piece mounting bracket with 3/4″ non-magnetic pickup, allows for easy adjustment while the engine is running.¬† Timing can be precisely set using the timing marks located on the pickup bracket and verified with a timing light.¬† Comes with CNC machined centering hubs for both sepentine and mandrel drive systems w/ keyways.