Re: HOW2 set cyl#1 to TDC on '84 500 SL ?

TDC for #1 cylinder. That's when #1 piston is at the very top of its stroke.

Look at the timing mark on the engine's harmonic balancer (behind the belts) for 00 degrees and / or you can remove the valve cover and turn the engine to 00 degrees and watch that both #1 valves are closed - if not turn engine one revolution. 00 degrees AND both #1 valves closed is TDC for #1 - any engine.
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