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Generation III Internal Engine
Gen 4 internals into gen 3

Generation III Internal Engine 1997-2006 LS1 | LS6

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Gen 4 internals into gen 3

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Old

May 16, 2023 | 10:56 AM

#1

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Gen 4 internals into gen 3

I have a lm7 I am building for a swap and planning on boosting.

I may have just acquired a lc9 with a cracked block due to freezing. Otherwise runs great

I was wondering if it would be worth it to slap the pistons and rods out of the gen 4 into the gen 3. Will put new bearings and rings and hone the block.

also maybe swap the 706s for the 799s

Thoughts?

Old

May 16, 2023 | 11:18 AM

#2

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From: Central Cal.

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The Gen IV pistons are flat tops, so yeah, use the 799's to keep compression sane.

Old

May 16, 2023 | 11:27 AM

#3

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So I should drop the gen 4 pistons and rods in?

Old

May 16, 2023 | 11:29 AM

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Quote:

Originally Posted by Bbknucks

So I should drop the gen 4 pistons and rods in?

If they're in good shape, I don't see why not.
Don't forget to switch the reluctor wheels to the 24x from the old crank.

Old

May 16, 2023 | 12:08 PM

#5

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I was planning on putting those pistons on the other crank but if swapping the reluctor isn't too bad then ill do that

Old

May 16, 2023 | 01:02 PM

#6

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Actually the cranks should be the same though I'm not positive about that.

Old

May 17, 2023 | 03:32 PM

#7

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I'm just gonna do rings and bearings on the 3 crank with the 4 rods and pistons and throw some boost at it and party

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Old

May 17, 2023 | 04:01 PM

#8

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From: JunkYard

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The Gen 4 stuff is heavier. Use the Gen 4 crank and swap the reluctor if you have too since its already balanced for the added weight.

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