The piston will come to TDC twice. Only one will be compression stroke. That’s why it is quite common for the inexperienced to get the engine 180* out of time. You want it on TDC during compression stroke only. Engines jumping time is quite common after a lot of miles. It usually happens when it’s running good and you shut it off. The rotating mass will cause the timing chain to skip a notch or two if it’s worn enough.
Martin '62 Chevy C-10 Stepside Shortbed (Restomod in progress) '47 Chevy 3100 5 Window (long term project) ‘65 Chevy Biscayne (Emily) ‘39 Dodge Business Coupe (Clarence) “I fought the law and the law won" now I are a retired one! Support those brave men/women who stand the "Thin Blue Line"! Hug a cop! USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
