They fit well on Buick heads with 1.5" spring pockets and yield some nice street/strip pressures. I ran them briefly on a set of Edelbrock heads to study the effects of different spring pressures. With shims you can tune the pressures across a very useable range. They are truly like new. comp cams 924 springs, set of 16, 1.509" dia. springs are dual with dampener, 347 lb/in rate, .655" max lift based on 1.89" installed height 115 lbs@1.89" 288 lbs@1.39" (.500" lift) 305 lbs@1.34" (.550" lift) with .030" shim 125 lbs@1.89" 299 lbs@1.39" 316 lbs@1.34" with .060" shim 136 lbs@1.89" 310 lbs@1.39" 327 lbs@1.34" Also includes comp cams 4771 locators(spring seats for .570 guides) comp cams 741 retainers(10 degree) comp cams 613 locks(10 degree for 11/32 stems) $150 for everything
