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99 LQ4 block interchangeable with a LSX block

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Old May 25, 2021 | 05:28 AM
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Default 99 LQ4 block interchangeable with a LSX block

The 427 GM performance LSX block is coming out and a 99 LQ4 block is going in.
Can I pull the flywheel from the LSX block and bolt it onto the LQ4 crank and simply swap the trans over (6 speed Transzilla)
Thanks for your help.
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Old May 27, 2021 | 07:35 PM
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Don't see why not as long as the crank flanges are the same just install a new pilot bearing while your there.
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Old May 27, 2021 | 07:45 PM
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No, flywheel bolt pattern is different.
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Old May 27, 2021 | 07:52 PM
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Series LS1,2,3,6,7 have 6 bolt crank flange bolt patterns. The LSA, LSX (aftermarket), and the new LT1 & LT4 engines have 8 bolt crank flange patterns. The LS9 uses a special 9 bolt crank flange pattern. Early 4.8L & 6.0L LS engines have an extended crank flange that requires a specific flywheel. So is the crank flange an 8 bolt or 6 bolt and do they share the same thickness?
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Old May 30, 2021 | 11:29 AM
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Just found the flywheel info -- Centerforce 700142 = Notes:
This will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange. FKKKKKKKKKKKKKKKKKKK
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