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Gen4 lc9 5.3

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Old Mar 5, 2020 | 12:51 PM
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Default Gen4 lc9 5.3

My buddy has a Gen3 5.3 lm7 running and driving with a comp. 76mm turbo .96 a/r. Block is stock, ls9 HG and heads have aftermarket springs, pushrods etc. for stage 2 turbo cam. 80lb deka injectors. 460 pump. 5spd.

The car is not tuned yet and a 5.3 lc9 gen4 block just popped up locally for $500. It’s 60k mile block removed from a 2010 truck. Block is aluminum. Seller took heads off it to use on a dart block so this has pistons and all still in it and working condition.

since the car isn’t tuned yet, he was debating putting his cam and heads into the gen4 block so he could run some more boost. Instead of stopping around 550ish on gen3 rods, he could push it to above or around 700ish on gen4 rods.

the real question here, what’s entailed on doing this and is it worth it? We arnt very familiar with the differences in gen4 or gen3 except the rods. I think it has another style crank sensor, cam gear needs be changed?
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Old Mar 5, 2020 | 01:03 PM
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Reluctor wheel on the crank is different. Unless he has an aftermarket ECU, it won't run.
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Old Mar 5, 2020 | 01:08 PM
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Originally Posted by AwesomeAuto
Reluctor wheel on the crank is different. Unless he has an aftermarket ECU, it won't run.
he’s running EFI LIVE on stock ecu. Think it’s a 0411 or something like that.
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Old Mar 5, 2020 | 02:48 PM
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Originally Posted by Z32_5.3
he’s running EFI LIVE on stock ecu. Think it’s a 0411 or something like that.
That won't run an LC9 without a Lingenfelter conversion box.
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Old Mar 5, 2020 | 03:10 PM
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Originally Posted by AwesomeAuto
That won't run an LC9 without a Lingenfelter conversion box.
ok thank you
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Old Mar 5, 2020 | 05:16 PM
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Originally Posted by AwesomeAuto
Reluctor wheel on the crank is different. Unless he has an aftermarket ECU, it won't run.
Couldn't he just swap the reluctor wheel and run the LC9 crank, rods, and pistons in the LM7 block?
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