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EXHAUST PORT HELICOIL STAINLESS WIRE INSERT.
THIS IS CERTAINLY NOT A D.I.Y JOB AS YOU WOULD NEED A SPECIAL TAP TO FORM THE THREAD (OUR TAP COST £500) OR THE CYLINDER HEAD WOULD NEED TO BE SET UP IN A MILLING MACHINE AND HAVE A THREAD SCREW CUT INTO THE EXHAUST PORT PRIOR TO INSERTING THE INSERT WHICH IS ALSO DONE WITH A SPECIAL TOOL.
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