Valve/Pushrod Adjustment

[GRX]

The straight 6 is a little different in that you will also need to remove the side push rod covers to observe the lifters. Otherwise it's the same as described.

Get an assistant. Remove the spark plugs so you can stick a pencil down the hole to confirm the piston is all the way up. Then have them bump the starter so you can observe the lifters moving up & down. When piston is up and both lifters are down, congratulations. Your lifters are riding the base circle of the cam during the compression stroke. Loosen the rocker nut, then slowly tighten it while spinning the push rod. Once resistance is felt tighten 1/4 to 1/2 turn more. Then move on the the next cylinder until you have done all six. And don't forget to re-install the valve & push rod covers.