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Generation III Internal Engine 1997-2006 LS1 | LS6
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Main bolt help

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Old 11-24-2010, 11:06 AM
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Default Main bolt help
Ok bought a 5.3 block and it came with the mains but not the smaller main bolts that go in from the sides. What size n length are they and can I just get class 10.5 hardened bolts?
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Old 11-24-2010, 11:37 AM
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I'm not sure what size they are but you can get them at your local dealer pretty cheap I would think. Part number 12556127. If you can't get them, call us and we can get them for you.

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Old 11-24-2010, 12:15 PM
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I would get the OEM bolts. They have a pretty significant influence on the housing bore for only torquing to about 18-20ft-lbs.
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Old 11-24-2010, 03:53 PM
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The OEM bolts also have a silicone seal molded under the bolt head.
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