Spark plug gap and torque

Goggles Pizano

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I only have a Gen2 service manual and helping a fellow Gen5 guy.

Told him to stick with the standard Champion platinums. The factory gap states 0.050 but I have seen recommended 0.035 (overall good gap), 0.044.

Stock car.

Also what is the torque spec for them? Told him NOT to use antiseize if the plug thread body is silver.
 

Steve M

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I have a 2010 Gen 4 service manual - by our powers combined, we might be in the ballpark?

The service manual lists the factory gap at 0.050" - that's what I've run on mine with the factory Champion RE10PMC5. Not stock, but not far from it.

Torque spec should be 13 ft-lbs (18 N-m) - I say "should" because they reversed the ft-lbs and N-m specs for multiple entries throughout the manual. As a sanity check, the Newton-meters torque specification number will always be higher than the foot-pounds torque specification number (1 ft-lb = 0.73756 N-m).

Screen cap to show what I'm talking about:

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Those numbers don't make sense for any of the specs given in ft-lbs/N-m unless you reverse them.

If you do use anti-seize, do NOT tighten to those specs.

I've used anti-seize on spark plug threads in the past, but have stopped since I noticed spark plug manufacturers recommending against the practice.
 
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Goggles Pizano

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1 ft-lb = 0.73756 N-m is not correct. That is flipped too.

1 ft-lb = 1.3558179483 N-m
 
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Goggles Pizano

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I've used anti-seize on spark plug threads in the past, but have stopped since I noticed spark plug manufacturers recommending against the practice.
If the plug body is black then a dab of antiseize.
 
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