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Fig. 18: View Of Tap Upper & Lower Marks, Fixture Plate Bushing
Courtesy of GENERAL MOTORS CORP.
11. In order to tap the new threads to the proper depth, rotate the tap into the hole until the marks (1 or 4) on
the tap align with the top of the drill bushing (3).
For the deeper cylinder head bolt holes, rotate the tap until the upper mark on the tap (4) aligns with the
top of the drill bushing.
For the shallower cylinder head bolt holes, rotate the tap until the lower mark on the tap (1) aligns with
2004 Chevrolet Corvette
2004 ENGINE PERFORMANCE Engine Mechanical (Repair Instructions 3 Of 3) - 5.7L - Corvette
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