Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

Chevy Monza Swap in progress

Thread Tools
 
Search this Thread
 
Old May 11, 2005 | 07:44 PM
  #1  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default Chevy Monza LS1 Swap in progress

I'm swapping a 1998 LS1 into my Monza 2+2. I'm wondering what would be the best wiring harness for this. I have the 98 computer and harness already. Is there a cheap aftermarket harness? I read Speartech is very good but $$$. Painless has a $499 harness but I was wondering if that is a plug & play harness? Is it pretty easy to wire in the stock harness? I'm using my built turbo 350 with 3000 stall and 3.73 gears. I just need the basics to get this running. I don't have to worry about emissions or anything like that.

Thanks,
Bill

Last edited by Monza355; May 25, 2005 at 08:14 PM.
Reply
Old May 11, 2005 | 08:23 PM
  #2  
hugger 6933's Avatar
11 Second Club
 
Joined: Nov 2004
Posts: 39
Likes: 0
Default

Originally Posted by Monza355
I'm swapping a 1998 LS1 into my Monza 2+2. I'm wondering what would be the best wiring harness for this. I have the 98 computer and harness already. Is there a cheap aftermarket harness? I read Speartech is very good but $$$. Painless has a $499 harness but I was wondering if that is a plug & play harness? Is it pretty easy to wire in the stock harness? I'm using my built turbo 350 with 3000 stall and 3.73 gears. I just need the basics to get this running. I don't have to worry about emissions or anything like that.

Thanks,
Bill
spend the bucks and send it to john . you won't regret it . SPEARTECH he did what he said he would do when he said he would do it. you can't go wrong with using his services. jim
Reply
Old May 12, 2005 | 08:12 PM
  #3  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default

Thanks, that does sound like the best way to go. Can't wait to drop it in this weekend. Hopefully I'll have the engine bolted in waiting for fuel and electronics to get done.

Bill
Reply
Old May 12, 2005 | 10:23 PM
  #4  
Tydriver's Avatar
Launching!
iTrader: (2)
 
Joined: Oct 2002
Posts: 230
Likes: 0
From: Indy, IN
Default

Pics or webpage of this swap ???

Sorta a soft subject for me as I had a 1980 Monza Spyder that had the 2.5L Iron Duke in it (Ugh...) Loved the car, but was a slow *** pig..

Sold it for an 86 Z24 and still regret it to this day.. x100
Reply
Old May 13, 2005 | 05:28 PM
  #5  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default

I have pics that I need to download and I'll have them up as soon as possible. The 2.5's are slugs, at least it was a Spyder! You should look at V8Monza. com. We have 1700 members and two big meets a year. There is a Vega going together in Norway with an LS1. He posts here as well.

Bill
Reply
Old May 14, 2005 | 06:56 PM
  #6  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default Pics







Thanks,

Bill
Reply
Old May 25, 2005 | 08:23 PM
  #7  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default

I got the engine to sit in the car. The camaro oil pan needs a small section taken out of the middle step in the sump. I'm getting this welded locally. The engine plates I'm using put the V8monza.com motor mounts right in the factory location. The 98 Camaro exhaust manifolds look like they'll fit real well, it may be a little tight on the passengers side. I'm going to replace the stock in tank fuel pump with 255lph in-tank pump and 3/8 line and run a corvette filter/regulator. I'll post more pics when I down load them from my camara.

Thanks

Bill
Reply
Old May 25, 2005 | 09:08 PM
  #8  
Frizzle Fry's Avatar
On The Tree
iTrader: (1)
 
Joined: May 2005
Posts: 177
Likes: 0
From: Oregon
Default

This guy (wait4me) is good with harnesses and tuning-> https://ls1tech.com/forums/conversions-swaps/324196-mail-order-pcm-tuner.html I'd change to 99+ ECM/Harness before it's too late though...
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-5

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-6

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old May 25, 2005 | 09:29 PM
  #9  
Phoenix 5.7's Avatar
TECH Junkie
iTrader: (7)
 
Joined: Aug 2004
Posts: 3,809
Likes: 0
From: Prairie de Femme, LA
Default

if u are going to run factory ehxaust manifolds, id look at 01-02 fbody manifolds, they flow a lot better than the 98-00
Reply
Old May 29, 2005 | 12:31 PM
  #10  
donnyonee's Avatar
Teching In
 
Joined: Aug 2004
Posts: 9
Likes: 0
Default

if you have the motor, pcm and harness, make it fit yourself. i put a 94 lt1 into a 88 944. changed the pcm location from the front left fender to the pass foot compartment. cut off what i didnt need and resized/relocated the rest. solder and heatshrink all the joints, worked fine.
Reply
Old Sep 24, 2005 | 07:04 PM
  #11  
Monza355's Avatar
Thread Starter
TECH Apprentice
20 Year Member
iTrader: (3)
 
Joined: May 2004
Posts: 311
Likes: 0
From: Ambridge PA
Default

My Monza is progressing very slowly. I need to get a 7" power brake booster to clear the coils on the drivers side. I'll have to fab up a new bracket for the power steering and I'm getting the S&P alternator bracket for the passenger side. I have to also get an O2 sensor bung welded in on the passenger side exhaust. I was at 3000 lbs with the iron headed 355 and me so I should be at 2700 with me after the swap and the other weight savings that I'm doing. I'll post pics soon.

Bill
Reply




All times are GMT -5. The time now is 05:00 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-04 18:13:20


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE