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05-18-2007, 10:16 AM
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#1
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Anyone ever put an LT1 into a 3rd gen?
Hey everyone,
I am about to do this swap & am looking for tips/tricks. I have read all of the posts over at 3rdgen.org and have a pretty good handle on things. (I think) But I just wanted to talk to someone else who has done the swap and get some more advise.
Thanks,
Mark B
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F-Bodyless 
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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05-18-2007, 10:57 AM
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#2
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12 Second Club
Join Date: Sep 2004
Location: Paramus
Posts: 898
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why not an ls1?
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05-18-2007, 10:59 AM
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#3
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Quote:
Originally Posted by mtg6486
why not an ls1?
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$$$$$
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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05-18-2007, 11:02 AM
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#4
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Justin hit it right on the head. The LS1 swap costs about 4k more than the LT1 swap in the end.
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F-Bodyless
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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05-18-2007, 11:05 AM
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#5
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12 Second Club
Join Date: Sep 2004
Location: Paramus
Posts: 898
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05-18-2007, 12:29 PM
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#6
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Yep & I am getting a 70k mile 96 LT1 for under $1000.
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F-Bodyless
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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05-18-2007, 12:31 PM
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#7
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Join Date: Aug 2004
Location: Somerset County
Posts: 5,559
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Quote:
Originally Posted by Mark B
Yep & I am getting a 70k mile 96 LT1 for under $1000.
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fyi i bought a complete 100k lt1 in great shape with all accesories for less than 500
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1999 Corvette FRC
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05-18-2007, 12:43 PM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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J0n, you are a knowledgible LT1 guy. That is a pretty straight-forward swap, no (at least for an EFI to EFI application)? I have limited knowledge of LT1s, but engine mounts and exhaust manifolds/headers are the same as a SBC, no? Some fuel line adapters, maybe some rad hose routing issues? I guess the ECM harness would be the biggest PITA, and even that should be too hard. Maybe the throttle cable? LOL
Am I off base? Learn me!
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-18-2007, 12:58 PM
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#9
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Join Date: Aug 2004
Location: Somerset County
Posts: 5,559
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Quote:
Originally Posted by BonzoHansen
J0n, you are a knowledgible LT1 guy. That is a pretty straight-forward swap, no (at least for an EFI to EFI application)? I have limited knowledge of LT1s, but engine mounts and exhaust manifolds/headers are the same as a SBC, no? Some fuel line adapters, maybe some rad hose routing issues? I guess the ECM harness would be the biggest PITA, and even that should be too hard. Maybe the throttle cable? LOL
Am I off base? Learn me!
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The fuel lines need to be modified. The motor mounts are all the same. The radiator needs to be swapped(due to reverse cooling of the lt1). Also, i believe you need the corvette serpentine assembly to retain a/c. Exhaust manifolds work fine and many shorty headers work as well. The biggest problem is splicing the lt1 wiring harness to the third gen dash harness, but there's people you can send your harnesses to that will perform the work for a couple hundred bucks.
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1999 Corvette FRC
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05-18-2007, 01:03 PM
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#10
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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Good info, thanks.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-18-2007, 01:14 PM
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#11
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Stalker
Join Date: Aug 2004
Posts: 12,082
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i put a 96 impala SS lt1 in my 79 vette. 6,609 original miles on that motor
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05-18-2007, 01:15 PM
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#12
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Quote:
Originally Posted by j0n
The fuel lines need to be modified. The motor mounts are all the same. The radiator needs to be swapped(due to reverse cooling of the lt1). Also, i believe you need the corvette serpentine assembly to retain a/c. Exhaust manifolds work fine and many shorty headers work as well. The biggest problem is splicing the lt1 wiring harness to the third gen dash harness, but there's people you can send your harnesses to that will perform the work for a couple hundred bucks.
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Are you sure the radiator needs to be swapped. I just bought a new one before my old motor took a crap.
From what I learned on 3rdgen.org the f-body ac will work, but you have to modifiy the crossmember a little bit. I am planning on having the harness modified for me. I want to make this swap as stress free as I can.
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01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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05-18-2007, 01:17 PM
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#13
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Stalker
Join Date: Aug 2004
Posts: 12,082
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lt1 coolant systems are reverse flow, meaning soemthign like the in for the rad has to be on the opposite site. i had my 79 rad cut and the tanks swapped and resoldered.
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05-18-2007, 01:20 PM
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#14
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Join Date: Aug 2004
Location: Somerset County
Posts: 5,559
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Quote:
Originally Posted by SmokingSS
lt1 coolant systems are reverse flow, meaning soemthign like the in for the rad has to be on the opposite site. i had my 79 rad cut and the tanks swapped and resoldered.
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like paul said you need to do something with the radiator...that new one you just bought as it sits will be useless
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1999 Corvette FRC
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05-18-2007, 01:25 PM
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#15
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Well that sucks.
To make this easy, will a 4th gen rad mount up to my 3rd gen brackets?
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F-Bodyless
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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05-18-2007, 03:02 PM
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#16
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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is it that the tanks on just on opposite sides or that the inlet and outlet are actually different?
if you all you need to is switch the inlet and outlet of the rad from side to side, i am pretty sure that the thirdgen V6 rads(same core, tank, and capacity as V8 rads) have the necks opposite of the V8's. that would make for an extremely easy swap with some stuff from the salvage yard and you can retain your stock fan set up.
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05-20-2007, 11:56 AM
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#17
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Join Date: Aug 2004
Location: Ewing, NJ
Posts: 164
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Quote:
Originally Posted by NJSPEEDER
is it that the tanks on just on opposite sides or that the inlet and outlet are actually different?
if you all you need to is switch the inlet and outlet of the rad from side to side, i am pretty sure that the thirdgen V6 rads(same core, tank, and capacity as V8 rads) have the necks opposite of the V8's. that would make for an extremely easy swap with some stuff from the salvage yard and you can retain your stock fan set up.
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if that's tru im gonna have a v6 rad outta an 89 rs that i cant use. ill let ya have it cheap mark. pm me.
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>2008 Corvette - Borla catback/K&N
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