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 LT1 Cam and emissions 
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Post LT1 Cam and emissions
Just wondering what people have been able to pass emissions here with. I have a 96 so it will have to go through the 2 speed idle test. I am in the process of ordering a cam from AI, however, they are unfamiliar with the emission requirements here and wanted me to let them know what cam specs will pass. As I am not too knowledgeable about this, I was hoping some of you guys could chime in. The cam will be going into a stock bottom end with aftermarket ported heads if that makes any difference. Thanks!


Wed Apr 22, 2015 6:29 pm
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Post Re: LT1 Cam and emissions
I had a 230/230 .600 lift 112lsa that passed with the old system. The limits are higher now too. It will depend on the pcm tuning forsure. I set my idle to 1150 rpm to smooth things out for the test. I had longtubes with 2 full size magnaflow cats.

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Wed Apr 22, 2015 7:14 pm
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Post Re: LT1 Cam and emissions
Keeping your intake and exhaust duration around 230 and make sure its cut on a 112lsa to keep the idle quality better. I passed with a 223/230 112lsa and the idle turned up. Im sure if AI ran there common 226/234 grind with a 112lsa over the 110lsa it would pass with good tuning.

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Wed Apr 22, 2015 8:55 pm
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Post Re: LT1 Cam and emissions
I passed emissions with an XFI 292 8)

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Thu Apr 23, 2015 2:16 am
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Post Re: LT1 Cam and emissions
That will depend on What compression you have. LT1s get away with it because of its cooling and some L98 because intake and pistons were nodded with it. IMHO 9.5:1 compression is the minimum for a 220+/230 duration(.050) that will make you pass easily..


Thu Apr 23, 2015 5:22 am
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Post Re: LT1 Cam and emissions
Thanks a lot for the responses! Hopefully this will help me with getting my cam spec'd out.


Thu Apr 23, 2015 5:31 pm
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Post Re: LT1 Cam and emissions
TRUTHINESS

LOL

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12.1 @ 112 mph 1.69 60'

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Fri Apr 24, 2015 12:04 pm
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Post Re: LT1 Cam and emissions
Ended up getting spec'd a 220/230-112 grind. Can't wait till it gets here!


Sun Apr 26, 2015 8:12 am
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Post Re: LT1 Cam and emissions
Heres something to keep you tied over till the parts get here 8)

https://www.youtube.com/watch?v=qMk2cN7EHEA

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1969 Firebird Sprint OHC 6 - 250ci/M5
1995 Trans Am - Blue Green Chameleon - 350ci/A4
1994 Fire-Am - Polo Green - 355ci/M6 380rwhp: SOLD


Mon Apr 27, 2015 8:21 am
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Post Re: LT1 Cam and emissions
If mine sounds even half as good I'll be happy! Where did you get it tuned if you don't mind me asking?


Fri May 01, 2015 11:28 pm
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