Valve springs with larger diameters require retainers to handle the higher pressures developed by the springs. COMP Cams steel retainers are the perfect solution. This 7? steel retainer for Chevrolet V6 and Small Block, as well as Buick V6 applications is precision machined from 4140 chromemoly steel and finished in black oxide. This precision retainer is specifically designed for positive location when combined with COMP Cams high-quality valve springs.