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Each manufacturer creates its own cam timing card. This is a Lunati cam card for a single-pattern 230 at 0.050 hydraulic cam. The top half of the card indicates the opening and closing points of the exhaust and intake lobes at the 0.050-inch checking height. Notice that the cam is ground 2 degrees advanced since the intake centerline (A) is at 107 degrees while the lobe separation angle (B) is 109 degrees. The lower half of the card identifies valve lift for the intake and exhaust as well as both advertised and 0.050-inch duration figures. A cam timing card will tell you just about everything you need to know about a cam. View Related Article
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