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Spark plug thread repair

Repairing a stripped spark plug threaded hole is simple and permanent. Most can be repaired without removing the cylinder head. New Full-Torque spark plug thread repair inserts are made of hard anodized aluminum for aluminum cylinder heads and steel for cast iron cylinder heads. This unique new repair technology will repair stripped and cracked spark plug holes better than new.

The special Spiralhook external threads on the insert increases the metal to metal contact between the insert and the cylinder head for maximum heat transfer which is absolutely critical allow the spark plug to operate at the proper heat range.

Each repair insert is permanently locked in place with a locking pin so that it will never back out after it is installed. The patented Full-Torque thread repair inserts produce stronger threads than original allowing the spark plug to be tightened tighter for better heat transfer.


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