2007 LQ4 Intake Swap Question
Thread Starter
Staging Lane
Joined: Sep 2014
Posts: 58
Likes: 0
2007 LQ4 Intake Swap Question I am wanting to swap the truck intake on my 6.0 build. Basically I am wanting something a bit more aesthetically pleasing. I can not afford a $1200 FAST intake.
Some information: The engine has DT mid headers and eventually I will be swapping to L92 heads and a cam. Way later (years) down the road I would like to add some forced air (prob a single turbo).
Q1) What intake options do I have? I see most people are using an LS6 intake? Does it matter the year because I see several ebay ads stating to check the year to ensure proper fitment.
Q2) What size TB do I need to run?
Q3) Will the stock injectors be plenty for now until I change heads/cam later?
Q4) The current computer/TB are DBW. If I switch the intake to cable, can a tuner correct this in the ECM or do I need a new one? Or will my current TB bolt up?
Sorry for all the repetitive questions that have prob been asked 10000000 times. I feel like I spend 3+ hours every night reading and searching for info and when I go to bed I'm even more confused than when I started. I'm lost as soon as the carburetor comes off....
Some information: The engine has DT mid headers and eventually I will be swapping to L92 heads and a cam. Way later (years) down the road I would like to add some forced air (prob a single turbo).
Q1) What intake options do I have? I see most people are using an LS6 intake? Does it matter the year because I see several ebay ads stating to check the year to ensure proper fitment.
Q2) What size TB do I need to run?
Q3) Will the stock injectors be plenty for now until I change heads/cam later?
Q4) The current computer/TB are DBW. If I switch the intake to cable, can a tuner correct this in the ECM or do I need a new one? Or will my current TB bolt up?
Sorry for all the repetitive questions that have prob been asked 10000000 times. I feel like I spend 3+ hours every night reading and searching for info and when I go to bed I'm even more confused than when I started. I'm lost as soon as the carburetor comes off....
12 Second Club
Joined: Jan 2014
Posts: 565
Likes: 0
From: 217
2007 was a changeover year from classic style to new style. Depending on if you have a GEN III or GEN IV engine one has a PCM and the later has a E38 ECM. Do you know which you have? E38 does not support DBC only E67 which is a GM crate engine ECM IIRC.
12 Second Club
Joined: Jan 2014
Posts: 565
Likes: 0
From: 217
A Ls6 intake and injectors should work "ok" for a stock engine. The Ebay check fitment doesn't apply here because the LS6 intake was never on a LQ4. You will need a Blue/green PCM that supports dbc.
Info here.
http://www.lt1swap.com/cable_conversion.htm
Use a truck dbc throttle body. It will interfere with truck water pump and idler pulley on truck alt/p/s bracket. Some have cut cruise bracket off of throttle body and squeezed together throttle cam with success, but most change out water pump to LS1 style. Truck alt bracket will require mod and idler relocation bracket or change to aftermarket corvette style.
Engine harness will require to pin in for tps and iac (7 wires total) and pcm will require flashed to dbc.
Info here.
http://www.lt1swap.com/cable_conversion.htm
Use a truck dbc throttle body. It will interfere with truck water pump and idler pulley on truck alt/p/s bracket. Some have cut cruise bracket off of throttle body and squeezed together throttle cam with success, but most change out water pump to LS1 style. Truck alt bracket will require mod and idler relocation bracket or change to aftermarket corvette style.
Engine harness will require to pin in for tps and iac (7 wires total) and pcm will require flashed to dbc.
Thread Starter
Staging Lane
Joined: Sep 2014
Posts: 58
Likes: 0
A Ls6 intake and injectors should work "ok" for a stock engine. The Ebay check fitment doesn't apply here because the LS6 intake was never on a LQ4. You will need a Blue/green PCM that supports dbc.
Info here.
http://www.lt1swap.com/cable_conversion.htm
Use a truck dbc throttle body. It will interfere with truck water pump and idler pulley on truck alt/p/s bracket. Some have cut cruise bracket off of throttle body and squeezed together throttle cam with success, but most change out water pump to LS1 style. Truck alt bracket will require mod and idler relocation bracket or change to aftermarket corvette style.
Engine harness will require to pin in for tps and iac (7 wires total) and pcm will require flashed to dbc.
Info here.
http://www.lt1swap.com/cable_conversion.htm
Use a truck dbc throttle body. It will interfere with truck water pump and idler pulley on truck alt/p/s bracket. Some have cut cruise bracket off of throttle body and squeezed together throttle cam with success, but most change out water pump to LS1 style. Truck alt bracket will require mod and idler relocation bracket or change to aftermarket corvette style.
Engine harness will require to pin in for tps and iac (7 wires total) and pcm will require flashed to dbc.
When you say they should work "OK" you don't sound like you are encouraging me to run this combo. LOL Like I said, I'm new to the LS based engines and sorta lost. If that isn't what I need, please be blunt and tell me. I'd hate to purchase something and regret it later. Do I just need an LS1 intake? I will be doing cam/heads/tune in a few months. Also I searched online and didn't find a lot of info about aftermarket DBW TB's. Is the common thing to convert it to DBC? I was going to try and keep the DBW because I read it was better for throttle response if tuned properly and required little to no maintenance as the cable did. Also the DBW has the cruise control built in and I was hoping to keep that as a feature for the truck.
I'm so lost....
Last edited by ChrisCoufal; Sep 20, 2014 at 11:27 AM.
Trending Topics
Thread Starter
Staging Lane
Joined: Sep 2014
Posts: 58
Likes: 0
So after asking some more questions it seems like I didn't realize the L92 heads (what I eventually what to use) are Gen IV square port. And the LS6 intakes as well? So I can't just do an intake swap until I change heads Is this correct?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo 12 Second Club
Joined: Jan 2014
Posts: 565
Likes: 0
From: 217
Ls6 is cathedral port. Ls3 intake is square port. You will have to use an aftermarket throttle body such as Edelbrock for dbc ls3.
YEs, PCM will say blue on one connector and green on other.
By "OK" I mean you may be close to 100% duty cycle on the injectors. Adding a bigger cam, headers, and better heads usually will require bigger injectors. You should be able to tune it with a stock engine and headers though and run well.
I believe you can bolt on the LS3 intake to your combo and run it. The port mismatch will most likely not be noticed on a stock engine. Add the bigger cam to it without changing heads to match will give you a tuning issue.
YEs, PCM will say blue on one connector and green on other.
By "OK" I mean you may be close to 100% duty cycle on the injectors. Adding a bigger cam, headers, and better heads usually will require bigger injectors. You should be able to tune it with a stock engine and headers though and run well.
I believe you can bolt on the LS3 intake to your combo and run it. The port mismatch will most likely not be noticed on a stock engine. Add the bigger cam to it without changing heads to match will give you a tuning issue.
Last edited by lsxRanger94; Sep 20, 2014 at 07:19 PM.
Thread Starter
Staging Lane
Joined: Sep 2014
Posts: 58
Likes: 0
Would it be easier to just mill these heads .030 to slightly raise compression, give them a good valve job and then just change cam/intake to match these heads? Again, I'm not looking to make 8 second passes with this truck and I tend to go overboard...LOL
Just looking for a strong running truck that has a nice thump and is a reliable driver.
Just looking for a strong running truck that has a nice thump and is a reliable driver.
12 Second Club
Joined: Jan 2014
Posts: 565
Likes: 0
From: 217
Since this is a daily driver and not a drag truck. You will want a cam that helps low and mid range torque not max power. I would look at some truck grind cams. They have a nice idle with lope and are fun to drive. The truck intake is excellent for building torque, but kind of ugly to look at. Some have shaved the garbage off of them to make them smooth and look good. Milling the heads on a true street engine will help a little in power department. If it were my truck, as long as the engine is sound, I'd put a small truck cam in it and a set of headers with a good tune and drive it for a while. Although changing H/C/I will make power in the upper RPM range, that is not where you will spend most of the time is this truck. Later down the road. a turbo still works excellent with stock 6.0. There are some sub 10.0 sec trucks with small cam and just a turbo.
Switching to the LS6 won't be worth the hassle. You won't notice any power improvement. As far as aesthetically pleasing, just shave it and paint it like I did.
Attachment 724592
Attachment 724592
Heres some threads on shaving the truck intakes
https://ls1tech.com/forums/generatio...video-how.html
https://ls1tech.com/forums/conversio...k-intakes.html
https://ls1tech.com/forums/generatio...video-how.html
https://ls1tech.com/forums/conversio...k-intakes.html