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LM7 block differences to LS1

Generation III Internal Engine 1997-2006 LS1 | LS6

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LM7 block differences to LS1

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Jul 20, 2020 | 09:56 AM

#1

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LM7 block differences to LS1

Hey guys, apart from the obvious aluminium vs cast iron difference and bore diameter, can anyone name any other differences in the block design?

I’m planning on building an ls1 (which I have) but using a cast iron lm7 block (1000+ Hp with boost) and just wondering if I’ll run in to any other anomalies between the two blocks. Thanks guys.

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Jul 20, 2020 | 10:21 AM

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External dimensions, bolt holes, thread patterns, all the same

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Jul 20, 2020 | 10:46 AM

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Quote:

Originally Posted by Darth_V8r

External dimensions, bolt holes, thread patterns, all the same

Thanks for a quick reply sir! oil galleries, oil path etc. the same do you know?

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Jul 20, 2020 | 10:50 AM

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Originally Posted by Kingswood_76

Thanks for a quick reply sir! oil galleries, oil path etc. the same do you know?

Identical. They are the same basic design all the way through.

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Jul 20, 2020 | 11:53 AM

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Same minus one bolt hole on the front of the block where the alternator bracket goes I think. The bracket will work without it but you could get the block drilled and tapped just in case.

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