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Spark Plug Question For 52 Special

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So i'm doing my first tune-up on my 52 Special and in the service manual it says to gap the plugs to 0.023 "GO" and 0.028 "NO GO". So my question is, what do "GO" and "NO GO" mean? I've never heard these terms before. I gapped them to 0.025 which is sorta' in between these two numbers and put them back in. I haven't started the car yet as I still have to put in the new points and condenser and it's worrying me now that I've had time to dwell on it and I'm wondering if I should have done it differently. Anybody have any info. on these terms or what I should gap the plugs to?

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