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Truck 5.3L with LS7 cam

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Old 08-12-2007, 04:02 PM   #1
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Default Truck 5.3L with LS7 cam

I recently just bought a truck 5.3 and i was wondering what it would take to install a cam from an LS7. Any info would be greatly needed. Thanks.
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Old 08-12-2007, 04:56 PM   #2
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I'm far from knowledgable about the LS7 cams, but I know an LS2 cam won't work in an LS1 car due to the differences in cam position sensor placement.

Not sure if that would be an issue going from an LS7 (Also Gen IV like the LS2) to a Gen III motor.
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Old 08-12-2007, 06:13 PM   #3
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It can be made to work, and now that the search is working a little bit better, said search will yield some results. Items needing to be changed to run the LS2 or LS7 cam will be front cover, LS2 style timing set, cam sensor extension harness, and plug rear cam sensor hole.

That LS7 cam is HUGE for a 5.3L motor! What stall, gear, supporting mods, etc do you have? What ar your plans for the truck? All race, all street, a mix, etc?
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Old 08-12-2007, 08:34 PM   #4
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I have a 02 camaro 6 speed trans. i want to make this a fun street truck. i was wanting to put a z06 cam in it and i found one on corvette forum out of an LS7. I know i plan on doing a better cam and hard valve springs. Any recomendations?
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Old 08-15-2007, 09:41 AM   #5
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What if i now choose to go with a cam out of a LS6. would that work without have to change those things other than putting different valve springs?
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Old 08-15-2007, 09:49 AM   #6
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You can make the LS7 cam fit, but the very high intake centerline and very late intake valve closing point would put the dynamic compression in a small 5.3L into the toilet. You would actually go slower with the LS7 cam in a 5.3L truck. Obviously, there are much better choices for the 5.3L, but I don't think the LS7 cam is one of them.
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Old 08-15-2007, 11:48 AM   #7
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The LS7 cam will not be happy in a 5.3L.

It's a 210/230 .561/.558 120LSA w/ 1.7 rockers. There is a lot of split to compensate for the "poor" flow of the exhaust ports and manifolds of the LS7. I'd go with a cam more custom tailored to a 5.3L or go with a LS6 Z06 cam.
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Old 04-19-2016, 12:04 PM   #8
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Quote:
Originally Posted by Patrick G View Post
You can make the LS7 cam fit, but the very high intake centerline and very late intake valve closing point would put the dynamic compression in a small 5.3L into the toilet. You would actually go slower with the LS7 cam in a 5.3L truck. Obviously, there are much better choices for the 5.3L, but I don't think the LS7 cam is one of them.
What about advancing the cam 8?
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Old 04-20-2016, 09:40 AM   #9
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Quote:
Originally Posted by danielblackst1 View Post
What about advancing the cam 8?
You do realize that you just revive a post that's almost 9 years old, right?
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Old 04-20-2016, 10:16 AM   #10
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Quote:
Originally Posted by danielblackst1 View Post
What about advancing the cam 8?
Quote:
Originally Posted by JoeNova View Post
You do realize that you just revive a post that's almost 9 years old, right?
An oldie but as goody.

Anyhoo. To answer your question Daniel, since the camshaft has such a wide lobe center angle, when you advance the camshaft to correct the intake valve events, you end up with a exhaust events that are much too early.

As Patrick said, the build will do much better using a camshaft designed for the application.
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