LS9 or LS7 cam swap???

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Jul 20, 2014 | 04:33 AM

BlackFya

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From: Durham North Carolina

LS9 or LS7 cam swap???

Has anyone done this to their LS3? I am looking to get a bump in power but still need to pass smog/emissions. Any feedback would be greatly appreciated?

Jul 20, 2014 | 09:52 AM

Wallacefl

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Quote:

Originally Posted by BlackFya

Has anyone done this to their LS3? I am looking to get a bump in power but still need to pass smog/emissions. Any feedback would be greatly appreciated?

...LS9 was done on the Camaro forum= 13 rwhp..LS7 would be about the same. You probably could get about 10-12 rwhp from the SLP 1.85 rocker arms instead of changing/doing the cam but would need to change the valve springs.

Last edited by Wallacefl; Jul 20, 2014 at 09:54 AM.

Jul 20, 2014 | 12:51 PM

Pitufina

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From: O'Fallon IL

Quote:

Originally Posted by BlackFya

Has anyone done this to their LS3? I am looking to get a bump in power but still need to pass smog/emissions. Any feedback would be greatly appreciated?

Too much work for minimal return. If you have to have a cam, then go custom. With a custom you can have the cake and eat it too.

Btw, you have to change the cam sprocket too since both are 3 bolt type unlike the 1 bolt in the ls3.

Jul 20, 2014 | 06:11 PM

Thunder8

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From: San Jose CA

Quote:

Originally Posted by Pitufina

Not even worth the hassle and cost for minimal gains! Go with a custom grind, get 40HP, maybe get the heads ported and polished while you're at it and get another 15-20 HP. Be sure to do the dual rocker springs while your swapping out the cam.

Jul 21, 2014 | 10:46 AM

Wallacefl

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if you are going to do the LS9 cam I would look into GMPP 19300535..probably not 40 RWHP but with a tune 30 seems possible. I have been looking at this "combo" also.

Jul 21, 2014 | 10:59 AM

Speedforhire

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From: Arkansas

The GM Hot Cam is rated at 480+ flywheel HP...........a substantial gain, on the LS3, with just a drop in and retune.

My thoughts are "GO BIG or GO HOME". It's not worth the time and logistics.

Jul 21, 2014 | 04:29 PM

n8dogg

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From: Rochester New York

How strict are the emissions tests in NC?

Jul 21, 2014 | 06:37 PM

old motorhead

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From: Southeast TX

Quote:

Originally Posted by Wallacefl

if you are going to do the LS9 cam I would look into GMPP 19300535..probably not 40 RWHP but with a tune 30 seems possible. I have been looking at this "combo" also.

That combo is an LS7 cam with CNC ported LS3 heads. For all of that, you get a whoppin' 40 hp increase? Get in touch with Pat G and get him to spec you a cam that will pass emissions. He's done a jillion of them.