Beehive Valve Springs

The Trick Flow® by PAC Racing Beehive Valve Springs are designed to enhance the performance of 5.7L and 6.1L Mopar Hemi Gen III engines. Manufactured by PAC Racing, these springs are constructed from high-tensile-strength, extra-durable Pacaloy™ chrome-silicon steel, a material known for its robustness. The springs are double shot-peened to meet rigorous Aerospace Material Specifications (AMS) reliability standards. These beehive-style valve springs are engineered as a direct drop-in for the specified Mopar Hemi engines, allowing for the installation of a more aggressive camshaft without the need for machining the spring seats in most applications. They are rated to handle up to 0.600 inches of valve lift and are designed to work with stock retainers and locators. The set includes 16 springs, providing a complete valvetrain upgrade. Key specifications include a spring rate of 408 lbs./in., a coil bind height of 1.160 in., and a seat pressure of 135 lbs. at an installed height of 1.800 in. The open pressure is 350 lbs. at 1.200 in.