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LT1 to LS1 97 Z28

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Old Apr 5, 2012 | 10:52 AM
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Default LT1 to LS1 97 Z28

i just picked up a 97 Z28 roller and im planning on swapping my ls1 and t56 over from my 98 Z, but i had a few questions i couldnt really seem to find on other peoples lt1 to ls1 swap fbodys. Since i have a 98 Z parts car what kind of wiring harness mods will i have to do? i heard the 98 harness and ecu is easier to adapt to work with the lt1 body harness, is this true? also for fuel will i need to use the corvette style fuel regulator? any help would be great! thanks
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Old Apr 5, 2012 | 04:29 PM
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Why don't you just use the fuel filter from your 98?

I don't get the reason for the swap? Why not just swap your front end.
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Old Apr 5, 2012 | 04:54 PM
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Originally Posted by alexcoreas
Why don't you just use the fuel filter from your 98?

I don't get the reason for the swap? Why not just swap your front end.
Thats what im trying to figure out, if i can use the fuel setup from my 98. I know lt1 used a return system and i know that 99 and up ls1 fbodys used a returnless. My question is do 98 use a return setup? And my 98 is a wrecked parts car and the 97 is a nice roller thats why im doing the swap
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Old Apr 5, 2012 | 08:27 PM
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Aaah got you. I've read that almost everyone goes with a vette fuel filter. This is the thread I'm using sorry I wasn't much help. I'm new to this too.


https://ls1tech.com/forums/conversions-swaps/1444740-ltx-lsx-conversion-sticky.html
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Old Apr 6, 2012 | 01:45 AM
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yea i read that, but no one seems to have used a 98 setup thats what im trying to figure out
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Old Apr 6, 2012 | 05:13 PM
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I have used the 98 set up. It is way easier to do the harness. just used wiring diagrams. 99 up DID use a return system!! The LS1 cars had a fuel pressure regulator built into the fuel pump housing. It had a pressure line going to a block in the line and it T'd off one going to rail and other going to the regulator. You can either use the vette filter and make some lines up OR since you have the 98 I'd use the fuel tank and lines. it'll be way easier to swap the lines then to make them. If you guys have any questions shoot me a pm.
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Old Apr 6, 2012 | 05:16 PM
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I'm changing my fuel set up so if anyone is interested i am selling my vette set up.
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Old Apr 6, 2012 | 06:56 PM
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Originally Posted by alexcoreas
Why don't you just use the fuel filter from your 98?

I don't get the reason for the swap? Why not just swap your front end.
this...just swap 'em out
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Old Apr 6, 2012 | 08:01 PM
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You're going in the right direction with the 98 harness. I'll be following this.
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Old Apr 7, 2012 | 01:16 AM
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Originally Posted by Rick Speed
I have used the 98 set up. It is way easier to do the harness. just used wiring diagrams. 99 up DID use a return system!! The LS1 cars had a fuel pressure regulator built into the fuel pump housing. It had a pressure line going to a block in the line and it T'd off one going to rail and other going to the regulator. You can either use the vette filter and make some lines up OR since you have the 98 I'd use the fuel tank and lines. it'll be way easier to swap the lines then to make them. If you guys have any questions shoot me a pm.
ok thanks man. ill deff have some questions down the road for you lol. so is the fuel system the only thing im gonna have to modify to work pretty much?
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Old Apr 7, 2012 | 11:58 AM
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Pretty much. The harness will be made to plug right in to your factory set up. PS will all be LS. Radiator not sure if its good from the LS car or not but if not you just cap off the one port on the bottom left side and use LS hoses. The ONE thing I strongly suggest using is the LS heater hoses. Make me an offer on my fuel lines and their yours for the right price
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Old Apr 7, 2012 | 03:07 PM
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Originally Posted by Rick Speed
Pretty much. The harness will be made to plug right in to your factory set up. PS will all be LS. Radiator not sure if its good from the LS car or not but if not you just cap off the one port on the bottom left side and use LS hoses. The ONE thing I strongly suggest using is the LS heater hoses. Make me an offer on my fuel lines and their yours for the right price
Yea my radiator is good from the 98, so i plan on using the LS radiator and heater hoses. what fuel lines do you have, are they just the stock 98 lines? cause i have all of those
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Old Apr 7, 2012 | 03:45 PM
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If you have a LT1 radiator I'd use it instead, it's a bit thicker and has more cooling capacity. LS1 guys often swap them out, it's not necessary, but a good mod if you ever needed it.
As said you'd need to block off the spout on the bottom left and make sure there's a plug where the level sensor would go if you don't have one.
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Old Apr 7, 2012 | 06:03 PM
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ill probly use the LS rad since ive never had any cooling issues with them before and since its thinner its gotta be lighter
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Old Apr 7, 2012 | 06:25 PM
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I have my factory line from filter to front and my made line that connects the filter return to the actual return line then you just add a new filter or use my filter that has 400 miles on it lol
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Old Apr 8, 2012 | 01:33 AM
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hmmm idk what im gonna do yet ill let you know
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Old Apr 8, 2012 | 01:38 AM
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Sick setup man can't wait to see the end result for sure !
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Old Apr 9, 2012 | 10:11 PM
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ok so here it is just got it today, 97 Z that will be the new home for LS1
Attached Thumbnails LT1 to LS1 97 Z28-97-z28.jpg  
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Old Apr 10, 2012 | 09:25 AM
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Use 97 car wiring, 98 Engine Harness and tweak it to plug into the car.

The 1998 Fuel System is dual line, but the 97 is the same way so just stick with that.
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Old Apr 10, 2012 | 09:43 AM
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Originally Posted by the_merv
Use 97 car wiring, 98 Engine Harness and tweak it to plug into the car.

The 1998 Fuel System is dual line, but the 97 is the same way so just stick with that.
what do i have to do to make the 97 body harness work with the 98 engine harness?
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