New design provides a simple and accurate procedure to set the required 25 degree ATDC cam sensor signal. Has built-in LED which indicates an exact setting point. You simply rotate your engine to Top Dead Center and this cap does the rest. No need to index your crankshaft away from the timing mark! Slotted Mounting permits "tweaking" adjustments required for aftermarket camshafts. Cap is made of reinforced glass-filled high temperature thermoplastic for high heat conditions. Replace your old-technology GM sensor with this functionally improved, newly-designed part.
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