mild lq4 build options
Thread Starter
Teching In
Joined: Oct 2012
Posts: 27
Likes: 0
From: Beaverdam, Wi.
mild lq4 build options I have a lq4 I would like to swap into my trans am. I also have a complete ls2 ( bad crank) to source parts from. My question is am I better off leaving the lq4 alone and just putting in a cam, swapping ls2 pistons and connecting rods, swapping the 243 heads, or a combination of the heads and pistons. I have read somewhere that the 243 heads would limit camshaft size, but I am not sure to what extent. I am just looking to make a little over 400 HP and have a usable power range for around town use as well as top end.
Thread Starter
Teching In
Joined: Oct 2012
Posts: 27
Likes: 0
From: Beaverdam, Wi.
That's what I've been leaning toward. I read somewhere that the 243s would have less PTV clearance thus limiting my can selection. I know the combustion chamber is smaller but I'm not sure about the depth of the valve faces in the chamber that would change the PTV so much. I guess I could check it out when I pull the 317s off. I believe the lq4 is an 03.
That's what I've been leaning toward. I read somewhere that the 243s would have less PTV clearance thus limiting my can selection. I know the combustion chamber is smaller but I'm not sure about the depth of the valve faces in the chamber that would change the PTV so much. I guess I could check it out when I pull the 317s off. I believe the lq4 is an 03.
Is the LS2 block junk?
Trending Topics
Thread Starter
Teching In
Joined: Oct 2012
Posts: 27
Likes: 0
From: Beaverdam, Wi.
I'd do HCI, I bought this car https://ls1tech.com/forums/vehicles-...-th350-va.html
felt pretty strong driving but ran it as is on the dyno & it only had 378 hp & 355 tq.
The dyno owner thought it was good but I thought it was a little weak, prob done better in my m6 car but never put it in.
felt pretty strong driving but ran it as is on the dyno & it only had 378 hp & 355 tq.
The dyno owner thought it was good but I thought it was a little weak, prob done better in my m6 car but never put it in.
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 Why not use the LS2 in your Trans Am? You could use the LQ4 crank, especially if it has a 24x reluctor wheel. Basically it boils down to whether or not you want an aluminum 6.0L or an iron 6.0L.
Thread Starter
Teching In
Joined: Oct 2012
Posts: 27
Likes: 0
From: Beaverdam, Wi.
Wouldn't the crank and ls2 pistons and rods need to be balanced together as an assembly? I kinda don't want to just mix and match internal rotating assemblies and expect them to work out. The head swap seems very straightforward while not compromising the balance of the engine. Not sure on the weights of the different components as the rods and pistons are different designs but I'm sure it'd be enough to matter. Correct me if I'm wrong.
The LS2 has better rods in it than the 03 LQ4... and as a result you need to run the LS2 pistons.
I'd ether run the LS2 block with the LQ4 crank and LS2 rods/pistons (balanced), with the LS2 conversion parts. Or, if the LQ4 block can be salvaged and you can sell off the LS2 block (it will be worth more), then run the LQ4 crank and LS2 rods/pistons...
Comes down to whether you want to spend the extra cash on the LS2 valley, front cover, and harness extensions, or if you want the extra 100lbs of the LQ4 block on the front of the car. Also, if the LQ4 needs to be repaired, the LS2 might be cheaper to put together.
I'd ether run the LS2 block with the LQ4 crank and LS2 rods/pistons (balanced), with the LS2 conversion parts. Or, if the LQ4 block can be salvaged and you can sell off the LS2 block (it will be worth more), then run the LQ4 crank and LS2 rods/pistons...
Comes down to whether you want to spend the extra cash on the LS2 valley, front cover, and harness extensions, or if you want the extra 100lbs of the LQ4 block on the front of the car. Also, if the LQ4 needs to be repaired, the LS2 might be cheaper to put together.
Wouldn't the crank and ls2 pistons and rods need to be balanced together as an assembly? I kinda don't want to just mix and match internal rotating assemblies and expect them to work out. The head swap seems very straightforward while not compromising the balance of the engine. Not sure on the weights of the different components as the rods and pistons are different designs but I'm sure it'd be enough to matter. Correct me if I'm wrong.
