One of the most important components involved with making big power is the camshaft. Comp Cams has been around for more than 32 years, producing high-quality valvetrain components for street and race. Comp has raised the bar with its new line of Thumpr Camshafts for 4.6L and 5.4L Ford engines. The Thumprs offer aggressive cam specs for improved performance, with the sound that only comes from big cams. Thumpr cams are designed to work in specific rpm ranges to improve performance without adversely affecting driveability.