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Cooler plugs on frankenmotor?

cal_look_zero
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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Just wondering if I should switch from the stock BKR6E11 to a 7 or even an 8? Seems like it would be a good idea with the higher CR the engine sees. Thoughts?

Check the color of the plugs after a few thousand miles. Nice tan color is what you want. Black carbonny plugs are too cold, powdery white is too hot.

Does it ping? If it don't, don't mess wit it. Cooler plugs are more likely to foul, especially when starting, then you get misfires and pulling plugs just to clean them up is a PITA.

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