Remove the broken exhaust manifold bolts. Tapered bolts center base plate over bolt holes and slip fit bushing allows you to move from hole to hole without moving base plate. Then the screw extractor is used to remove the broken bolt.
Lisle 71400 Manifold Drill Template for GM LSIII Engines, Bolt Removal Jig
71400 Manifold Drill Template For 1999-2007 GM / Chevy LSIII 4.8 5.3 6.0L Motors
Manifold Drill Template Broken Bolt fits GM Chevy LSIII 4.8L 5.3L 6.0L LIS-71400
Lisle 71600 Manifold Drill Template Ford 4.6L, 5.4L And 6.8L
Lisle 71600 Manifold Drill Template Ford 4.6L, 5.4L & 6.8L
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