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Some iridium plugs, like DENSOs already come pre-set with a protective sleeve over the firing end, to protect the gap. DENSOs compensate for normally recommended gap settings that are smaller than the pre-set value. You may have to gap your NGKs, especially if you have any mods (e.g., nitrous, turbo-chargers, super-chargers, high power ignition systems, etc.).

To re-gap your plugs, here are DENSO's instructions:

"Use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center. To increase the gap size: Step 1 Use needle nose pliers or spark plug gapping tool to bend the ground strap up to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN. Step 2 Re-check the gap with a calibrated gapping tool. To decrease the gap size: Step 1 Use the same method as above, however bend the ground strap down to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN. Step 2 Re-check the gap with a calibrated gapping tool. WARNING: Failure to follow these directions may permanently damage the spark plug. Note: Never use a round gapping tool to check the gap or to increase or decrease the gap setting."
 
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