[nkaminar]

One other modification that is commonly done is to machine off the top of the casting where the valve lifters go through. This allows access to the adjustable valve lifters. If this has not been done you may have to adjust the lifters when the valve is up and measure the clearance when the valve is down.

The rule of nine can be applied to this procedure too. Instead of working on one valve at a time and having to turn the engine over 360 degrees several times for one valve, adjust the valve that is up while measuring the valve that is down. So applying the rule of 9, assuming starting with valve 8 up, measure 1. Record the value. Then rotate the engine until the next valve is up and measure the one that is down. Continue until you have measured and recorded all 8. Then adjust the one that is up. Rotate until the next valve is up and adjust that one. At the same time check the adjustment for the one that is down. Continue until all are adjusted and checked and all have the correct clearance.

By the way, it helps to have the spark plugs out while turning the engine over. But stuff rags in the holes so that you don't accidentally drop something down there.