does she know about it?
LT1 in a 1989??
Thread Starter
Racer
Joined: Jun 2007
Posts: 367
Likes: 0
From: Springfield MA
LT1 in a 1989??
I have an LT1 engine in my basement that is about half rebuilt; and a few days ago i bought a 1989 corvette with an L98. It is my understanding that LT1's did not come in the C4 vette's for a few more years. My question is, can i drop an LT1 in with out cutting and part of the car. I would like the option to put it back to stock if and when i desire.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Physically, the engine will be a drop-in, but making the swap calls for (at the least) a different wiring harness, different computer (PCM), accessory brackets, etc. It's do-able, but from my point of view a real PIA.
A while back I has been thinking of going the other-way-round: installing a 415 CID L98 Mini-Ram engine I have into my 96 Vette which has and LT1. After considering all the changes I'd have to make, I decided to just build a LT1 stroker (should be installing it this weekend).
Jake
A while back I has been thinking of going the other-way-round: installing a 415 CID L98 Mini-Ram engine I have into my 96 Vette which has and LT1. After considering all the changes I'd have to make, I decided to just build a LT1 stroker (should be installing it this weekend).
Jake
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I did the LT1 conversion into my 84 and it was not bad.
As stated you will need a motor harness and ECM
I modified a stock harness my self but Jims Performance will convert one for you at a fair price.
I used a C4 LT1 Assy bracket and Assy's but you will need to have A/C lines fabed because the A/C moves to the drivers side. The only other things I can think of is fabricating Fuel lines with the quick disconnects for the Fuel rail and return and finding a place for the steam vent return. I was able to use the stock radiator, exhaust and motor mounts. For teh steam vent return I removed the low coolant sensor and taped the hole for a nipple.
As stated you will need a motor harness and ECM
I modified a stock harness my self but Jims Performance will convert one for you at a fair price.
I used a C4 LT1 Assy bracket and Assy's but you will need to have A/C lines fabed because the A/C moves to the drivers side. The only other things I can think of is fabricating Fuel lines with the quick disconnects for the Fuel rail and return and finding a place for the steam vent return. I was able to use the stock radiator, exhaust and motor mounts. For teh steam vent return I removed the low coolant sensor and taped the hole for a nipple.
Melting Slicks
Joined: May 2004
Posts: 2,286
Likes: 2
From: Stamping Ground KY
I did the LT1 conversion into my 84 and it was not bad.
As stated you will need a motor harness and ECM
I modified a stock harness my self but Jims Performance will convert one for you at a fair price.
I used a C4 LT1 Assy bracket and Assy's but you will need to have A/C lines fabed because the A/C moves to the drivers side. The only other things I can think of is fabricating Fuel lines with the quick disconnects for the Fuel rail and return and finding a place for the steam vent return. I was able to use the stock radiator, exhaust and motor mounts. For teh steam vent return I removed the low coolant sensor and taped the hole for a nipple.
As stated you will need a motor harness and ECM
I modified a stock harness my self but Jims Performance will convert one for you at a fair price.
I used a C4 LT1 Assy bracket and Assy's but you will need to have A/C lines fabed because the A/C moves to the drivers side. The only other things I can think of is fabricating Fuel lines with the quick disconnects for the Fuel rail and return and finding a place for the steam vent return. I was able to use the stock radiator, exhaust and motor mounts. For teh steam vent return I removed the low coolant sensor and taped the hole for a nipple.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Yes it was a complete LT1 swap. I used a 95 F-body ECM and intigrated the harness into my existing 84 harness to keep it as stock as possible but when I sold the motor I converted it to a simple 4 wire hook up and the guy who bought it droped into a 86 Suburban. The real trick is to use the Corvette assy bracket because it puts the Assy's high and out of the way so you don't have to be concerned with them hitting the frame.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
