Valve timing and Caliper questions

[AV8oR]

>>The flywheel mark is the best guide for TDC, and is easy to find by 
>>using the piston check to get close.
>>Huw Powell

My flywheel mark was 10 degrees off. I marked the spots on the harmonic
balancer where the piston started and stopped moving as I turned the
crank. I chose the middle as TDC. Purrs like kitten!
BTW, how's this possible?

Zaf
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