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Hello all.
As has been correctly stated, valve to piston clearance is least slightly off TDC.
So the method I use is a variation of the one posted.
I use a very light spring, and assembl;e it all witha wide tappet clearance.rotate and press down on the valve to check the free play frequently.
Close up the tappet a bit repeat..very soon you will work out where the clearance is least..
I don't use any measuring tool, just my fingers and eyes..
And then when you get real close to clash, just work back and fore about that point using the dial guage or the tappet screw thread pitch to get the actual number..
Kind regards
David
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