I used the pin the first couple of times, but then I broke it off so now I remove the injector on #1 and use a dial indicator to find absolute TDC, not real fond of the drop valve method personally, but to ech his own.
I'm a machinest by trade, and measureing things really really precise is what I do. With that said, the best way in my mind is measuring off the piston itself.
As to "close enough", the difference in 1* of timing isn't really much in reltation to the crank, but makes a noticable difference in the performance of the engine, so I guess that's a relative term and everybody has a different definition.
Yes, it's a very bendy one with fine tune adjustments and a very long adapter on the end of the indicator. Imade the adapter out of a piece of MIG welder liner cut to length and heat shrunk to the end of a smaller adapter that fit inside the liner. Then I can screw it into the end of my indicator when I need the extension and take it off when I need other adapters.
I use a dial indicator on the #1 intake valve. On the intake stroke I find TDC and go .050 before and marking the dampener in with a fixed point on the block each time. I then split the differnce and line that up with the same point I used earlier. I have seen the pin close to 1/2" off using this method.
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