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I use NGK BPR8ES spark plugs. They are copper resistor plugs and are 2 steps colder than the Bosch W6DC. If you want Bosch, you could use W5DC or W4DC. I have a euro 3.0 engine in a race car.
I would use the colder plugs with your new engine. If they are too cold they will "carbon up" after a few thousand miles. If they do you can go back to the hotter plugs.
-Andy
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72 Carrera RS replica, Spec 911 racer
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