Copyright © 2011  rockerarms.com  All rights reserved F11M Roller Rocker Arms (1.6:1) for Mummert’s Ford 312 “Y” Block Aluminum Heads This rocker assembly is custom designed for Mummert’s 312 “Y” Block Aluminum Heads. FIVE different rocker arms with 3 different roller offsets and 4 different screw offsets. The rocker arms are machined from 2024CF billet aluminum for greater strength and durability. Bronzed bushed for extended life and grooved for best oiling. Hard chrome plated OEM shafts. Oil holes at the roller tip and adjustment screw for direct oiling. Springs, washers, and pins included. All parts are packaged and labeled individually. Includes instructions with color photos for easy assembly. Click instructions above to download a pdf of the instructions. Smith Brother’s adjustment screws and 12 point nuts for greater strength. ALL PARTS MADE IN THE USA!!!! Oil holes for best oiling. Rocker number is stamped on the adjuster side of the rocker for easy assembly. Half assembly shown ready for shipping. Half assembly shown on Mummert’s Aluminum Head.