I have done it when I changed from a hydr to solid lifter on the motor in the car. I was ASSURED it would ABSOLUTELY fit! I have trust issues, so I installed checker springs and a dial indicator on valve tip. Rotated the crank through a cycle stopping every 5 degs when the piston started to get closer to tdc. Push down on the valve tip to see what the tightest clearance was. They were right, there was PLENTY, but I could sleep easier checking. I would not approach the min. piston to valve clearance measuring this way. NOT precision, but worth it to me if I’m not pulling a head.
