Crane Cams' Gold Race Roller Rocker Arms are made from heat treated, extruded aluminum billet bar stock for ultimate strength. Needle bearing fulcrum and roller tip for maximum friction reduction. Improves response, increases HP and RPM, lowers oil temp. For most 4, 6 and 8 cylinder domestic engines. Different ratios, pushrod seat offsets and stud sizes available. Crane Cams' needle-bearing fulcrum, roller-tip, extruded aluminum rocker arms have been racing's most popular aluminum rockers since their introduction in 1964. Now, over four million rockers later, the nation's leading racers and engine builders know they can trust the strength, ratio accuracy, quality, and reliability of Crane's famous gold anodized, aluminum rockers. The TR fulcrums are now included in all 7/16" stud gold race extruded rocker arms at no additional charge! Custom ratios, offsets, and stud sizes are available. Usually requires screw-in studs or rocker stud conversion kit on heads. May require modification of stock valve covers for clearance. Will not fit Chevy 90° V-6 or small-block Chevy V-8, 88-99 self-aligning heads.Pit Stop USA offers Crane Cams Gold Aluminum Race Rocker Arm Set - Ford 302-351C Boss, 429/460 Ford - 1.73 Ratio, 7/16" Rocker Arm Stud 27750-16 at low everyday prices. Be sure to check out all of our products from Crane Cams including Crane Cams Aluminum Roller Rocker Arms - Small Block Ford.