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The twelfth and final generation of the Cadillac Eldorado was introduced in 1992 as a two-door coupé.

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What size of tap to clean headbolt fhreads on the 4.6 motor

What size of tap used to clean headbolt threads on the 4.6moror

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Windy Martinez  just for completion sake. The thread size is M11x1.5

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2004 and after uses a M11x2.0

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One other point. You really shouldn’t clean bolt holes with taps. The problem is taps can cut and damage threads. There are clean-out taps that are made specifically to clean threads. Much better option. They usually come in a kit that will cover both metric and standard sizes.

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Windy Martinez will be eternally grateful.
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