LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

LSX swap questions

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Old 01-28-2012, 06:42 PM
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LSX swap questions

These are just a few questions I have regarding my swap. I'm close to dropping the motor in (hopefully next week) and I've got a lot of things running through my mind.

I've been looking at everyones air intake and I'm considering ordering the parts from intakehoses.com and just building one myself. Question is, what exactly will I need to run the intake from a FAST 78 mm TB to below the battery location on the drivers side of the car? ( I am using a stock MAF and IAT).

I ordered a Lokar throttle cable. How does this attach to the 3rd gen pedal? Anyone have pics? Did you keep or remove the bracket this is attached to where the pedal bolts to the firewall?

Is anyone using the 4th gen dual fans with a 3rd gen radiator? How did you attach them?

I'll probably have more questions as the days go by and I continue to think about other things.
Old 01-28-2012, 09:17 PM
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Re: LSX swap questions

Ive been using a Summit radiator with the dual fans from a 4th gen, and I used cable ties around the tanks on both sides thru the mounting holes on the fan. Ill grab a pic tomorrow for ya.
Old 01-28-2012, 09:43 PM
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Re: LSX swap questions

Sounds good thanks
Old 01-28-2012, 10:47 PM
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Re: LSX swap questions

I have the 4th gen fans and stock third gen radiator. There's a couple tab looking things on the fan housing that I trimmed off and the fans now sit flush against the radiator. I also used cable ties/zip ties to hold it to the radiator. I also modified the radiator shroud, particularly trimmed off the upper coolant hose resting place. My shroud is more or less just a plate now that is bolted down like stock. I'll post pics when I'm on my computer (on my phone)


I made my own intake as well, and it goes down under the driver side battery tray. I cut a hole and the filter is down close to the ground. The only parts I used were two 90* elbows, one is a short radius the other is a longer radius, a 4" section of polished aluminum, a 4"-3 3/4" reducer for the maf, and a bunch of t-bolt clamps. And a filter of course.
Old 01-28-2012, 11:03 PM
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Re: LSX swap questions

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Another look at the intake

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Old 01-29-2012, 07:30 AM
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Re: LSX swap questions

Thanks for the pics. It looks really good. So your MAF is located right before the elbow near the battery tray? Also where did you locate the IAC?
Old 01-29-2012, 09:28 AM
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Re: LSX swap questions

Thanks, I have a 5 wire truck MAF that has a built in IAT.
Old 01-29-2012, 10:17 AM
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Re: LSX swap questions

Originally Posted by POP6482
I ordered a Lokar throttle cable. How does this attach to the 3rd gen pedal? Anyone have pics? Did you keep or remove the bracket this is attached to where the pedal bolts to the firewall?
When you install the cable, I would recommend cutting off and modifying the stock throttle cables firewall connector to work with the Lokar cable end, to ensure correct cable angle alignment with the pedals pull angle. Here is a picture of how I modified mine to get the angles correct. There are multiple steps to this in my LS1 build thread if you decide to go this way. Another option is to use fender washers at the firewall with the Lokar adjuster, but the angles are incorrect which cause the cable to scrape at the exit of adjuster to the pedal.

I would reuse the throttle bracket as well, as it provides the throttle closed stop for the pedal itself.

Here is a pic of the Lokar throttle cable installed on the 3rd gen pedal. Stock throttle pedal insert used (Black plastic cable guide that clips onto pedal itself) then added an internal spacer (bushing inside plastic cable guide) to provide a flat surface for the Lokar cable end to rest against.

This setup works as smoother as the stock cable operation.
Attached Thumbnails LSX swap questions-p1050108_c.jpg   LSX swap questions-p1050121_c.jpg  
Old 01-29-2012, 06:03 PM
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Re: LSX swap questions

Originally Posted by BlueZee28
Thanks, I have a 5 wire truck MAF that has a built in IAT.
What size air filter is that??
Old 01-29-2012, 06:04 PM
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Re: LSX swap questions

HP...thanks for the info and pics of the pedal. I'll be putting it together tomorrow.
Old 01-29-2012, 10:54 PM
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Re: LSX swap questions

To be honest I'm not sure what size the filter is, I just picked up a 4" inlet filter off the shelf at auto zone. I dont know how long it is though.
Old 01-30-2012, 01:24 PM
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Re: LSX swap questions

So the consensus is 4th gen fans 3rd gen radiator works the best? I don't currently have either but will be hitting up the junkyard for some and have my pick of either 3rd/4th gen fans/radiators
Old 01-30-2012, 02:47 PM
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Re: LSX swap questions

From what I have read on here, the 3rd gen set up is plenty for the swap. The only reason I'm using 4th gen fans is because my original didn't work and I found these at a great price.
Old 01-30-2012, 06:28 PM
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Re: LSX swap questions

I'm not sure of the dimension differences between third gen and fourth gen fans, but I know my fourth gen fans cool really well. In 98* weather my car would run at about 180 or less
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