 GNG-14 (14mm) |
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 GNG-18 (18mm) |
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 GNG-78 (7/8" - 18) |
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 GNG-22 (22mm) |
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| These precision, hardened and ground, gauges can tell you if the spark plug ports are good or bad. If the "GO" side of the gauge fails to "GO" into the port, then the port threads are undersize. If the "NO GO" side of the gauge screws into the port, then the port threads are oversize. |
Thread Go-No Go Gauge Recommendations For Specific Engines
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