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Why risk cross threading the head or getting dirt down the tubes? You don't even have to filly remove the plenum. If you loosen it and take the braces loose you can lift it enough to get to the plugs. You have to blow the sand and dirt out before you remove the plug. Any dirt will fall in the hole, any sand will get on the head threads. I always used anti-seize when installing new plugs also. Some would disagree saying it prevents heat disapation. But I feel on aluminum heads it prevents thread damage.
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