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Old 01-11-2011, 02:12 PM
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The old iron heads also had issues with the plugs getting frozen but the threads could always be cleaned up. The spark plugs used the compression washers for sealing with the heads. New aluminum alloy heads are easier to strip and need a helicoil to repair the threads. Dissimilar metals between the plugs and the heads cause an electronic current that creates corrosion thus the frozen plugs. To fix that, the new plugs have a special coating. It is critical that the torque is right or the plugs will either loosen up and fly off like in the Fords, or freeze due to over torque.
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