The piston stop method works fine running up to the stop both ways since the slop in the system will be taken up when the piston jams against the stop and the error cancels out. When using the dial indicator you must do the measurements in the same direction on both sides of TDC. You would run the crank clockwise up to the .200" dial indication (or any other number you like), reverse direction but go past the .200" so you can sneak up on this measurement again going clockwise. When done this way, the dial indicator method is every bit as accurate as the piston stop method. Not taking measurements going in the same direction with a dial indicator will induce error in the amount of play encountered.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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