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2002 430LSX vac level?

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Old Oct 18, 2016 | 03:41 PM
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Default 2002 430LSX vac level?
I was wondering at idle what the proper vac level is? My gauge reads 5 and low at idle.

Thoughts?

430LSX race motor

Running Na

With a blower cam just no post yet
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Old Oct 18, 2016 | 09:16 PM
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What cam is in it? 5" hg is pretty damn sorry. But if it's a race motor... It'll probably scream up top.

How does it drive?
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Old Oct 18, 2016 | 10:49 PM
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What are the specs on this "blower cam"?
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Old Oct 19, 2016 | 12:22 PM
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I'm an idiot i didn't have the vac line connected to the vac block.

I'll send an update tonight
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Old Jul 15, 2017 | 10:13 AM
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Originally Posted by JakeFusion
What cam is in it? 5" hg is pretty damn sorry. But if it's a race motor... It'll probably scream up top.

How does it drive?

Current cam is:

Duartion @.050 238/247 .637/.629 Lobe SEP 112 Degree +4 ADV)



im seeing 20" at idle


it drives bumpy but needs a retune.

the blower isn't on yet and the can is a blower cam. Is that the normal amount of vac at idle? Gauge says low vac.
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Old Jul 15, 2017 | 01:52 PM
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Originally Posted by Patsy57
Current cam is:

Duartion @.050 238/247 .637/.629 Lobe SEP 112 Degree +4 ADV)



im seeing 20" at idle


it drives bumpy but needs a retune.

the blower isn't on yet and the can is a blower cam. Is that the normal amount of vac at idle? Gauge says low vac.
20" at idle seems about right with that size cam to me. But i am no expert, you have more vacuum than me and my cam is a 238 and 625 lift on both sides iirc
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Old Jul 15, 2017 | 06:47 PM
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What vac level do you run?
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Old Jul 15, 2017 | 06:53 PM
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Originally Posted by Patsy57
I was wondering at idle what the proper vac level is? My gauge reads 5 and low at idle.

Thoughts?

430LSX race motor

Running Na

With a blower cam just no post yet
Originally Posted by Patsy57
Current cam is:

Duartion @.050 238/247 .637/.629 Lobe SEP 112 Degree +4 ADV)



im seeing 20" at idle


it drives bumpy but needs a retune.

the blower isn't on yet and the can is a blower cam. Is that the normal amount of vac at idle? Gauge says low vac.
Those are some odd looking 430" blower cam specs. What head, intake and blower?
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Old Jul 15, 2017 | 07:43 PM
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Blower is an F1R cog drive. Heads are AFR 225 cathedral port, intake is a FaST 102
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Old Jul 15, 2017 | 07:58 PM
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Originally Posted by Patsy57
Blower is an F1R cog drive. Heads are AFR 225 cathedral port, intake is a FaST 102
You have a big engine with smallish heads, a long runner intake and an aggressive blower. If I have spec'd that camshaft, it would look more like 242/258 on 116. That cam you have there will likely be RPM limited, and leave power on the table.
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Old Jul 15, 2017 | 08:59 PM
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I'm going to be upgrading the heads soon gonna go with AFR 235 heads or TFS 245
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Old Jul 18, 2017 | 11:25 AM
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I'd move over to an LS7 head on a 430.

And that cam looks like a good NA cam for a streetable 402.
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Old Jul 18, 2017 | 01:23 PM
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When looking at LS7 heads what do I have to worry about in regards to valve placement ?
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Old Jul 21, 2017 | 11:00 AM
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Originally Posted by Patsy57
What vac level do you run?
i see around 13-15 inches 750 rpm idle, but im just starting to get the tune lined up
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