Bring Cam to Base circle for the tappets you wish to adjust.
Rotate the engine. Watch the intake valve open (pushrod goes up) and then close (pushrod goes down). Continue rotating slowly until the cylinder's piston reaches top dead center (TDC). The cylinder that you're adjusting will now have both its tappets on the base circle of their camshaft lobes. This is the lowest point in the tappet blocks for the tappets. Notice: Valve is on its seat and fully closed.
Adjust the pushrods
Bring pushrods to Zero lash, no up and down movement, tight against rocker arm, and tight against tappet/lifter.
Mark the pushrod with a marker or paint stick.
Extend the pushrod (4) four full turns or 24 flats (if using S&S Pushrods, S&S pushrods have a 32 Threads per inch)
Allow the tappet/lifter to bleed down 20/30 minutes, longer is better.
If after 20/30 minutes you can spin the pushrod with your fingers you do not have limited travel tappets (HL2T kit).
If you do not have HL2T or Travel limited tappets, lock the pushrod down. Repeat process for the other cylinder and pushrods, you are now done adjusting.
If you do have HL2T or Travel limited tappets move on to the next step.
If you cannot spin the pushrod, you have S&S Limited Travel tappets (HL2T kit).
From this point you want to shorten the pushrod. While shortening you will feel drag on the pushrod, this is the valve spring tension.
While shortening, you will feel the valve spring release the pressure on the pushrod. When the adjustment is correct, you will again be able to spin the pushrod with your fingers. The pushrod must spin freely. with NO up and down movement.
From this point you want to shorten one full turn, 6 flats.
Lock down the pushrod and repeat for the rear cylinder.
DO NOT TRY TO MAKE SHORTCUTS IN THIS PROCESS. Proper bleeding down of tappets, is critical for healthy running motors. Damage to motor will happen not following these instructions.