Crane Cams first introduced the racing world to aluminum rockers in 1964, and since then we've manufactured and sold millions of Crane aluminum rockers! From the beginning, our famous Gold-Race Aluminum Rockers have been continually enhanced with design and engineering improvements as well as material upgrades. Now, many generations later, today's Crane Cams Aluminum Rockers are still the strongest, most ratio-accurate, most durable aluminum rockers made. Crane Cams offers aluminum rocker arms for nearly all American V8 and V6 engines, plus many inline four and six-cylinder applications. Stock, plus optional longer-than-stock ratios, are offered for most engines. Some applications also provide offset pushrod seats for use on aftermarket cylinder heads with non-stock port locations. All Crane Cams Aluminum Rockers come complete with a set of positive locking adjusting nuts, or adjusting screws, at no extra cost to you.