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.

LT1 overheating

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Old Mar 8, 2008 | 04:43 PM
  #1  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
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LT1 overheating

Just wrapping up the rest of lt1 swap, installed an aftermarket temperature gauge and its reading over 200, and spits the water/antifreeze back out to coolant tank continuously. any suggestions
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Old Mar 8, 2008 | 07:49 PM
  #2  
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: LT1 overheating

You have to purge the air out of the system with the vent screw in the top of the waterneck on the water pump, make sure you have a towel under it to keep the water from dripping on the Opti.
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Old Mar 8, 2008 | 08:26 PM
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

How do you have everything hooked up? Have you bled it? Have you bled it some more? It really can take a while to get all of the air out.
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Old Mar 8, 2008 | 09:08 PM
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

I did try bleeding it once but same results. I did not hook up the 2 small necks under the radiator cap neither, but I did find my water pump leaking from its weep hole
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Old Mar 8, 2008 | 09:16 PM
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

Sounds like a bad water pump.
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Old Mar 8, 2008 | 09:34 PM
  #6  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

hey what did you all do with those 2 small necks under radiator cap
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Old Mar 8, 2008 | 09:52 PM
  #7  
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

I am running a third gen radiator. The one right below the cap is overflow for the reservoir. The big one under it is a heater return from the core. If you are running a 4th gen radiator it is a little different. The one under the cap is the overflow and the one beneath that is to the steam vent off the back of the heads. Where is your steam vent hooked?
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Old Mar 8, 2008 | 10:58 PM
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

i do not have it hooked up
----------
hey by the way what is normal operating temperature for the lt1's temperature gauge reading

Last edited by 86iroc504; Mar 8, 2008 at 11:01 PM. Reason: Automerged Doublepost
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Old Mar 8, 2008 | 11:54 PM
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

You need to hook that up to relieve pressure in the rear of the heads. An LT1 runs between 215 and 230 stock.
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Old Mar 9, 2008 | 02:55 PM
  #10  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

hey i found those reverse cooling lines afterall I just need to run the hose to it and replace the water pump and that should be it
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Old Mar 9, 2008 | 06:56 PM
  #11  
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

Awesome. Do you have any pics? I always like to see new swaps.
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Old Mar 9, 2008 | 07:02 PM
  #12  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

not yet but I will finish everything up next weekend and post pictures. My torque arm holes are not lining up with holes on transmission to mount. what did you do to get yours on
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Old Mar 9, 2008 | 07:07 PM
  #13  
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

Are you going from an automatic to a manual? The mounts are different. There are two types of torque arms also. One faces one way and the other faces the other way.
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Old Mar 9, 2008 | 07:16 PM
  #14  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

no its automatic, but the holes are not matching up, what options do i have
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Old Mar 9, 2008 | 07:36 PM
  #15  
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

Are you using your factory torque arm bracket? Factory torque arm? How exactly is it not lining up?
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Old Mar 9, 2008 | 08:13 PM
  #16  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

yes everything is factory, the torque arm holes and the mounting holes on the transmission are not lining up evenly
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Old Mar 9, 2008 | 08:56 PM
  #17  
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: LT1 overheating

Pull the crossmember and try lowering the transmission down and see if that helps. It might give you more room to maneuver the two peices.
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Old Mar 10, 2008 | 12:32 AM
  #18  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

let me clarify it better, the holes are not lining up at all, by like 1 inch
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Old Mar 10, 2008 | 09:09 AM
  #19  
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From: waco,texas
Car: 1991 Pontiac Firebird
Engine: 383 LT1
Transmission: built 700r4 and fuddle 3500stall
Axle/Gears: 4th gen 3.42 auburn
Re: LT1 overheating

put the mount from your 700r4 on the 4l60e if your using one
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Old Mar 15, 2008 | 01:05 PM
  #20  
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From: Nawlins
Car: 86 Camaro
Engine: '03 4.8 vortec
Transmission: 4l60e
Axle/Gears: 3.42
Re: LT1 overheating

ok I have a new waterpump and the reverse cooling lines are hooked up and the air dam is on but she still is getting hot.It is fine when idle going from 170-190 at idle, but when I accelerate the temperature goes up 210-230+. the coolant in the coolant tank holds up ok, never gets too low, never get to high
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Old Mar 15, 2008 | 03:23 PM
  #21  
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: LT1 overheating

are you seeing flow in the radiator while it's idling? Normal temp on an LT1 is 190 like any normal engine, other than when idling and stock temp for the fan to come on is 220.
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