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What year did GM switch to the new short head bolts?

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Old 05-19-2007, 11:20 AM
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Default What year did GM switch to the new short head bolts?
And what was the last year they stopped using the long bolts? THANKS!
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Old 05-19-2007, 12:23 PM
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2004 .
Last edited by PREDATOR-Z; 05-21-2007 at 11:55 AM. Reason: correcting
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Old 05-20-2007, 09:16 AM
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Sometime after Jan '04. Mid year through the '04 production run. Mine was built in June '04 have all the same bolts. Part of the changeover to the LS2.
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Old 05-20-2007, 11:56 AM
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Are there any differences in the blocks other than the length of the head bolts?
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Old 05-21-2007, 08:56 AM
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Bolt holes might not be tapped as deep. Other than that, I don't think anything changed with the blocks. They were still LS6 blocks like the later F-Bodies.
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Old 05-21-2007, 11:38 AM
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January 2004 was the change-over date.
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