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Here on the exhaust side we can see the Black Label logo on the thick deck area (0.750-inch deck thickness) of the head. The exhaust ports (89cc) have stock type D-shaped exits, but are shaped and CNC ported to out-flow stock castings. Looking at the rail for the valve cover and the mounting pads for rocker stand and valve springs, it's noticeable these heads are taller (roughly 3/4-inch) than stock (see the next photo). This enabled the ports to be slightly raised and contoured inside the head to increase air flow.