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99 lq4 block bored to 4.065

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Old 05-29-2020, 11:16 PM
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Default 99 lq4 block bored to 4.065
anyone had luck with early lq4 block being bored to 4.065? Couldn't find info on 99 blocks.
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Old 05-30-2020, 04:41 PM
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Old 05-31-2020, 09:57 AM
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Originally Posted by Lsandlteditor
anyone had luck with early lq4 block being bored to 4.065? Couldn't find info on 99 blocks.
While GM states max bore at 60 over, it's safe to go .065 it's been done many times and very common .For peace of mind have it sonic checked . Here are the LQ4/9 casting numbers 12551364, 12573581, 12577184
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Old 06-01-2020, 08:31 AM
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I daily drive a 2001' #1364 casting block punched 0.065 over! The max of 0.060 is nonsense according to my machinist who says he's taken a few of them past 0.100 without issue!
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Old 06-01-2020, 10:35 AM
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I’ve bored them .065 over without issue. I sonic checked 2 different LQ blocks and they only seem to be thin between cylinders, front to rear not the thrust sides.
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Old 06-01-2020, 10:58 AM
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Originally Posted by stockA4
I daily drive a 2001' #1364 casting block punched 0.065 over! The max of 0.060 is nonsense according to my machinist who says he's taken a few of them past 0.100 without issue!
Yes most of these blocks will go .085 , but the problem is the biggest aftermarket performance piston you can find is 4.085 . There are OEM replacement cast piston for L92 that go up to 30 over which would be 4.095 .
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