Hughes rocker arm pedestal shims

Shims under the rocker shaft are to get the rocker pad centered on the valve stem. Getting the correct length pushrod solves the adjuster stud problem. Spend the time to get the rocker centered on the valve stem. Put some grease on the valve stem and crank the engine. The mark on the valve should be centered. The shims will change it. You can buy .030 sheet aluminum at the hardware store. Cut it to size , put them under the shaft and let the fun begin. It's a pain but well worth it. Incorrect rocker geometry will cause all kinds of problems. Buy an adjustable pushrod to get the correct length and have Smith Bros. make you some .085 wall 5/16 rods. Remember a shortcut is the fastest way to somewhere you didn't want to go.