spark plug gap

[trimta]

1997 mercruiser 5.7 vortex w/4-bbl carb. anyone know what the spark plug gap should be?

 

[kghost]

.035" for standard plugs.
Platnum and others are different

 

[trimta]

I was told that the vortex motor the gap should be 50-60, just tryn to find the actual gap for this motor. There is iridium plugs in the motor.

 

[kghost]

You need to identify if it is a NON GEN II or a GEN II engine.

Non Gen II have 12 bolts to intake manifold.

Gen II have 8 bolts to intake manifold.

Here is what the manual specifies,

 

[trimta]

I have 8 bolts aluminum manifold. Thank you for helping me.

 

[RicardoMarine]

I was told that the vortex engine the gap should be 50-60, just tryn to find the actual gap for this engine. There are iridium plugs in the engine.

https://www.briskusa.com/spark_plug_gap_spark_plug_gap_chart

Nut shelling this, your ignition system (secondary coil voltage and amperage), fuel/air mixture, cylinder pressure, etc., will all determine the gap between the inner/outer electrode.

For example...... a .050" or .060" gap would be used for a HEI or high output ignition system.





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[kghost]

https://www.briskusa.com/spark_plug_gap_spark_plug_gap_chart

Nut shelling this, your ignition system (secondary coil voltage and amperage), fuel/air mixture, cylinder pressure, etc., will all determine the gap between the inner/outer electrode.

For example...... a .050" or .060" gap would be used for a HEI or high output ignition system.





.

Disregard that post.

You gap your spark plugs exactly to the OEM manufactures specifications. END OF STORY.

The only time you need to make adjustments to a spark plug gap is after heavily modifying engine.

F'n Pin head!