Endurance Beehive Valve SpringsCaracteristicas: FEULING BEEHIVE valve springs use a much smaller and lighter weight retainer which drastically reduces the valve weight creating a much quicker revving and smoother motion than comparable dual valve springs FEULING endurance springs are a direct bolt in replacement up to 650 cam lift no machining or rocker box clearancing required Eliminate valve spring separation, maximize stability, reduce valve train noise & harmonics FEULING