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

Crank Bolt Size

Old 02-07-2019, 04:56 PM
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Default Crank Bolt Size

I have my engine out currently and I want to chase all of the threads before I put it all back together. I want to double check the crank / harmonic damper bolt thread. Is it 7/16-20? I don't have this size in NF in my tap kit so I want to make sure I order the right one.
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Old 02-07-2019, 05:17 PM
84 4+3
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I believe that's correct
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Old 02-07-2019, 06:31 PM
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Take the bolt to the hardware store and double check it against a nut. Or get yourself a thread pitch gage, they are not that expensive and can help prevent a costly error. they make English and Metric that cover all the popular sizes. I have an English but not Metric, so I just time a trip and go into the hardware store and check. Ours actually has a display for checking thread sizes.
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Old 02-07-2019, 07:23 PM
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yes it should be what you said
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Old 02-07-2019, 08:42 PM
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Please be sure NOT to chase it with a tap - chase it with a thread chaser.

Last edited by Ed Ramberger; 02-07-2019 at 08:43 PM.
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