The best way is to make sure that the valve's counter part on the opposite firing cylinder is completely open, for example:
You are adjusting #1 intake. Bar the engine over until #6 intake is fully open and then #1 intake's lifter will be on the base circle of the cam. Measure and adjust. Repeat, then wipe hands on pants.


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A lone amateur built the Ark. A large group of professionals built the Titanic.