Ls7 cam in an ls3

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Dec 30, 2016 | 03:08 PM

#21

CAMMOTION PERF

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Joined: Dec 2014

Posts: 507

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Quote:

Originally Posted by fonzo

has anyone done this? I've heard of it being done before but just curious what everyone else thinks. I've heard it's a decent swap if you're just wanting a cheap cam upgrade but not chasing after every ounce of hp for a fun street driver.

also, after browsing here just recently i've thought about maybe upgrading the valvetrain to spin the motor to the 7k+rpm range. Is the ls7 cam a decent cam for this?

before anyone mentions it, I can see that if you're going to upgrade the valvetrain to spin to 7k+, you may as well just buy a new cam at the same time that takes advantage of that rpm range. I'm just curious about the ls7 cam in an ls3 as this was a setup I was thinking about doing before a few minutes ago.

Fonzo,

The LS7 camshaft will indeed make more horsepower and carry it further in the RPM range than the LS3 camshaft. But, it is not all win. The LS7 camshaft will lose about 20 ft pounds of torque down low and likely not start making more power than the LS3 camshaft until nearly 5000 RPM. So, you will be giving up low end torque to gain about 20 horsepower over 6000 RPM.

With a good aftermarket camshaft like our Titan 3 LS3 camshaft, you will gain power everywhere:
http://store.cammotion.com/titan-3-ls3-camshaft

If I were going to do all of the work associated with changing a camshaft, I would want the best camshaft I could get, even if I had to invest a little more. I would spend a few more bucks now to avoid the disappointment later.

May 31, 2020 | 07:08 PM

#22

c4love

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Joined: Nov 2015

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From: DFW Texas

Quote:

Originally Posted by irnwkrkev

You'll get at least 20hp and it'll rev higher.

I've had an LS9 cam in my LS3 for over 20,000 miles with stock valvetrain and the limiter set at 6,800rpm with no issues. It peaks lower but the power hangs in there and doesn't drop off quickly.

Idles at 600rpm!

Did you ever DYNO this setup? Just curious what kind of power you made with the LS9 cam..