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DIY LS3 Intake Porting

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Old 08-02-2018, 07:09 AM
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C5Natie
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Default DIY LS3 Intake Porting + Radius Rods

Hey there folks. Just sharing this project I've been working on. I had an extra LS3 intake laying around and decided I would try my hand at porting it. I have ported aluminum intakes before with good results but never an OEM plastic one.So, I figured, what the heck. This intake will be going on my LS3 2011 C6 along with a 103mm throttle body when I install my cam. I'm hoping to test and compare it to the untouched stock intake that is on the car now. Anyway, I made a video (boring lol) of me showing what I did to the intake, where I cut, sanded and ported as well as what I learned along the way. Curious to see what gains I may see but either way its cool when you know you did it yourself.
Things I did, 1) opened up intake to accept 103mm tb and smoothed out opening transition. 2) Removed EGR tube, 3) removed center posts and filled holes with epoxy, 4) sanded and smoothed down any ridges including those along the runners and roof areas







Rough cuts. Just getting started opening up the intake for the bigger tb


Sanding away. Removal of center post, EGR tube and sanding of casting ridges.


Epoxy holes where support columns were


Basically finished. Need to clean up before install.


No more obstructions.



A look inside a stock intake. You can see all the things in the way of airflow.




Last edited by C5Natie; 08-07-2018 at 08:33 AM.
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Old 08-02-2018, 02:13 PM
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Old 08-02-2018, 09:50 PM
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Sub'd...when do you anticipate installing/testing it?
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Old 08-03-2018, 10:43 AM
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Have you considered installing rods?
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Old 08-03-2018, 07:48 PM
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Originally Posted by MTPZ06 View Post
Sub'd...when do you anticipate installing/testing it?
Im hoping towards the end of this month or sooner if possible. Waiting for a lift to get freed up at my buddies shop.
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Old 08-03-2018, 07:50 PM
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Originally Posted by Ragtop 99 View Post
Have you considered installing rods?
I have. I need to look around and see what may work in terms of rod size and design. What I would like to do is test without and then with the rods to see if there's a difference in hp/tq.
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Old 08-07-2018, 08:03 AM
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Making stainless radius rods for the intake. Decided not to be lazy haha. So many claim that the rods are the big difference makers so we'll see. Will share more info when done pretty soon.

Last edited by C5Natie; 08-07-2018 at 08:31 AM.
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Old 08-10-2018, 02:49 PM
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Went with 6061 Ultra-Corrosive Resistant Architectural Grade Alloy, T6 Temper aluminum 1/4" half round rods vs a round rod. We'll see how well it works.


The rods are extremely light and are held on by high temp epoxy. Epoxy runs the full length of the rods.

Last edited by C5Natie; 08-10-2018 at 02:50 PM.
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Old 08-10-2018, 04:05 PM
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Looks awesome! How many hours do you have into it? Let us know how the testing goes, solid work!
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Old 08-10-2018, 06:24 PM
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Originally Posted by Beef97 View Post
Looks awesome! How many hours do you have into it? Let us know how the testing goes, solid work!
Thanks man. I have probably 8-10hrs into it but now that I know and made the tools to do the job, it would take me a few hours less if I were to do it again. Hoping to see some gains as well hopefully. I already have a few guys wanting for me to port their intakes too lol.
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