
All is not lost! It is possible to repair high-performance engines with damaged block threads and cylinder heads with damaged spark-plug holes.
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Amazon.co.uk
5.0
£29.50
Qnkaa 151pcs Thread Repair Kit Helicoil Insert Sleeves Metric M5 M6 M8 M10 M12 Stainless Steel Tap Drill

Amazon.co.uk
5.0
£20.88
88pc Thread Repair Set Kit Helicoil M6 M8 M10 Thread Inserts Taps & Drill Bits