Is it really possible? I haven't checked mine, put everything back together to their timing marks but havetnt started it up
If I check compression for #1 then what is the adjacent cylinder that should be on exhaust? 6? Can't get the tester back there to the other head.
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Thinking logically, yes its possible. The piston will get to TDC on 2 of the 4 strokes in a cycle: compression and exhaust.
When at TDC of compression, the spark plug needs to fire, which is why the rotor will line up with the #1 cylinder plug wire.
When at TDC of exhaust, the spark plug WONT fire, so the rotor will not be pointing at plug wire #1
If you havent removed your distributor completely, you can tell you're at TDC of compression stroke on cylinder #1 by lining the timing pointer up with the left most notch on the crank pulley and checking to see the rotor is pointed at where the #1 plug wire would be (IIRC its in the 4 or 5PM position if the distrib cap were a clock). I initially didnt even think about the rotor position so I had used the compression tester instead. Rotor position is much easier provided the distrib hasnt been removed/reinstalled.
Im not sure which cylinder would be on exhaust at the point of #1 being at TDC of compression.