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How to Measure Riser Height for 8.1L 496

When replacing your stock 496 manifolds and risers, it's key you get your new headers built to the right height. Measure from the flange to the top of the riser. For example, if your riser measures 16-1/2" tall, you need to order an 8" taller system. Once you have the correct measurement, you can order the correct system for your boat. Click here to see 496 header options from CMI.