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Yes you can, but you can do a better job with less mess by adjusting the preload with the engine not running.

With the engine at #1 TDC, you can set 1, 2, 5, & 7 intakes and 1, 3, 4, & 8 exhausts. Rotate the engine one revolution to #6 TDC and adjust the rest.

To adjust: tighten the nut on the rocker until there is no up and down motion of the pushrod (0 backlash) plus an extra 1/4-1/2 turn for preload.

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