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LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Head bolt tap size?

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Old Mar 18, 2005 | 08:04 AM
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89305rs
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Head bolt tap size?
What size tap should i use to clean out the holes in the block? What size and pitch are the head bolts? Thanks-Joe
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Old Mar 18, 2005 | 08:15 AM
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mrz28 73/97's Avatar
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Re: Head bolt tap size?
I believe they're 7/16 x 20 coarse thread.
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Old Mar 18, 2005 | 08:48 AM
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Re: Head bolt tap size?
Use a thread chaser-not a tap. 7/16-14 is what you want.

7/16-20 is fine thread.
Last edited by shoebox; Mar 18, 2005 at 08:50 AM.
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