1. 2.5 GM cylinder head
2. crack extending across induction-hardened exhaust seat
3. using the extension kit to drill
4. LHC724 heat-conductive sealant
5. installing first L6AS stitching pin
6. first pin after installation
7. grinding down tops of installed pins
8. last hole drilled in center of seat
9. finish grinding the repair with a stone
10. finished repair after texturizing with needle scaler
11. seat cut over repair; no insert installed
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