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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Oil plug thread size

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Old Aug 8, 2021 | 05:04 PM
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Default Oil plug thread size
Does anyone know the correct thread size for 1991 L98 oil drain hole?

I know it’s a 14mm head, but cannot find info on the threads
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Old Aug 8, 2021 | 06:32 PM
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1/2" x 20 threads per inch....
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Old Aug 9, 2021 | 07:50 AM
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Seems unlikely that the plug would have a metric head and SAE threads.
Most likely a 9/16" hex.
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Old Aug 10, 2021 | 05:25 PM
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If you get a digital C4 factory part number catalog. They will usually list the thread pitch of the bolts/screws.
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