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For those looking to install the best rocker arms in the industry in their diesel, then look no further than Harland Sharp. They have been developing high performance rocker arms since the 1950s and throughout the years have committed to maintaining a 100% Made in the USA philosophy. Built from high grade aluminum and featuring a roller tip design, your valvetrain will never run smoother than with a set of Harland Sharp Roller Rocker Arms. It really is a pity you have to cover these up with the valve cover(s)!