Yes, I did have to shim both of them slightly. One trick: if you don't have the proper shims or washers to use... take some eyelet style wire terminal crimp-on connectors and cut the eyelets off. Then file the area where you cut the crimp portion off to make it a smooth circle on the outer diameter. They make fine spacers in a pinch. I figured this out some years ago at the racetrack. The alcohol funny car I drove had an injector nozzle plug up and we had one cylinder go lean right at the finish line. When it did the cylinder temp shot up and it hurt the exhaust valve. The valve head tuliped slightly. Enough to where I couldn't get any valve lash on that one even with the adjuster backed all the way into the rocker arm (aftermarket Jesel shaft system). So after a little thought I figured out that making some spacers that would fit/bend to follow the contour between the rocker arm shaft and stand that it bolted to would move the shaft/arms up on that cylinder and allow for me to have some valve lash. Cut up 3 ends to fit the 1 bolt on each side and 1 between the pair of arms on that cylinder and all was fine. Got my valve lash, made the last qualifying run... and ended up winning the race and season championship.