LT1 to LT4 upgrade kit?
Thread Starter
5th Gear
Joined: Jun 2004
Posts: 5
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From: Orebro Narke
LT1 to LT4 upgrade kit?
Hello
I found this kit on summit, http://store.summitracing.com/partdetail.asp?part=NAL%2DGMP3287%2D1 to my -92 LT1 Corvette. I wonder if someone have this kit in his car. I also wonder if there are any better kits "out there" I have also looked at http://www.ttperformance.net/shop/pr...a6b898b598787f and http://www.ttperformance.net/shop/pr...a6b898b598787f
Tell me what you think and what your experiences how to upgrade the LT1.
/Mike
I found this kit on summit, http://store.summitracing.com/partdetail.asp?part=NAL%2DGMP3287%2D1 to my -92 LT1 Corvette. I wonder if someone have this kit in his car. I also wonder if there are any better kits "out there" I have also looked at http://www.ttperformance.net/shop/pr...a6b898b598787f and http://www.ttperformance.net/shop/pr...a6b898b598787f
Tell me what you think and what your experiences how to upgrade the LT1.
/Mike
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
Re: LT1 to LT4 upgrade kit? (SlowGedda)
Well its all a matter of how much faster you really want to go. I personally wouldnt just do a LT4 upgrade, If I had an LT1 I would want more then that for that much work.
Set your goals, then pick your parts
Set your goals, then pick your parts
Thread Starter
5th Gear
Joined: Jun 2004
Posts: 5
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From: Orebro Narke
Re: LT1 to LT4 upgrade kit? (StealDads67)
Well, goals, hmm, to beat my fathers old C3 Corvette -71 454 LS6 with doug nash 5-speed manual, and he said that these engines(cars) are to modern to go fast with. Computerised junk he said 
.
So he can not tell me what i should buy. He ran an 11.03 "back in the days" of 1984. So that is my goal.
What do you think i should do?
And does that LT4 Kit really make 425+ hp?
/Mike
.So he can not tell me what i should buy. He ran an 11.03 "back in the days" of 1984. So that is my goal.
What do you think i should do?
And does that LT4 Kit really make 425+ hp?
/Mike
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: LT1 to LT4 upgrade kit? (SlowGedda)
That kit is not going to make 425 just bolted in, it'll need a full headers and exhaust system to even make it close, and it still wont make 425.
All you need is to have the LT1 heads and intake ported and polished with the Hotcam and RR, this will make more power than the LT4 stuff in bolt-on form.
Run a search for Nathan Plemons, he has similar mods and full dyno results for everything in his signature.
All you need is to have the LT1 heads and intake ported and polished with the Hotcam and RR, this will make more power than the LT4 stuff in bolt-on form.
Run a search for Nathan Plemons, he has similar mods and full dyno results for everything in his signature.
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Re: LT1 to LT4 upgrade kit? (SlowGedda)
My H/C package is 360 HP, not close to 425 hp.
Melting Slicks
Joined: Jul 2003
Posts: 3,413
Likes: 138
From: Texas
Re: LT1 to LT4 upgrade kit? (jodyeastman)
If you want to run 11 flat then you're gonna have to do more than heads/cam. If you want to even be close to 11s, install some 4.10 gears, ported and polished AFR or Trick Flow or some other brand heads, an agressive cam, re-work the intake, long tubes, full exhaust... you have alot of work to do. 11 seconds is FAST!
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Thread Starter
5th Gear
Joined: Jun 2004
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From: Orebro Narke
Re: LT1 to LT4 upgrade kit? (ZF Six)
Hello again, yes I know it is fast, but I hafto be faster than my old man so what can you do? 
Sure I will hafto take the whole engine apart and balance it or replace it and so on. On the other hand, we have about 7months of winter where I live so I sure got the time.
What parts should I be getting then?, heads, cam, pistons, headers, exhaust, supercharger??!
/Mike
Sure I will hafto take the whole engine apart and balance it or replace it and so on. On the other hand, we have about 7months of winter where I live so I sure got the time.
What parts should I be getting then?, heads, cam, pistons, headers, exhaust, supercharger??!
/Mike
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
Re: LT1 to LT4 upgrade kit? (SlowGedda)
Try this site: http://www.morepreformanceinc.com
Look at the packages for the corvettes. They do good work if you need a "turn key" job.
[Modified by Strick, 3:45 PM 6/24/2004]
Look at the packages for the corvettes. They do good work if you need a "turn key" job.
[Modified by Strick, 3:45 PM 6/24/2004]
Thread Starter
5th Gear
Joined: Jun 2004
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From: Orebro Narke
Re: LT1 to LT4 upgrade kit? (vader86)
Vader86: thats for the tip on the Nathan Plemons site, very interesting reading indeed.
Strick: I dont need a "turn-key" job, And I live in Sweden so I can't bring it to the USA in any easy way. Thanks anyway
But I still need to order everything from the USA, that is why I was thinking of a kit to buy, easy management
/Mike
Strick: I dont need a "turn-key" job, And I live in Sweden so I can't bring it to the USA in any easy way. Thanks anyway
But I still need to order everything from the USA, that is why I was thinking of a kit to buy, easy management
/Mike
Race Director
Joined: Feb 2003
Posts: 11,672
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From: Lake Wylie SC
Re: LT1 to LT4 upgrade kit? (SlowGedda)
Sorry I gave you a bad link. It's: http://www.moreperformanceinc.com
And they will just sell you the parts.
And they will just sell you the parts.
Race Director
Joined: Feb 2003
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From: Lake Wylie SC
Re: LT1 to LT4 upgrade kit? (Strick)
Take a look at this package: http://www.moreperformanceinc.com/lt4_396.htm
Thread Starter
5th Gear
Joined: Jun 2004
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From: Orebro Narke
Re: LT1 to LT4 upgrade kit? (LT1Vetteguy78)
Strick: thanks for links. I espacially looked at the 425hp kit, and it seemed very cheap for those hp? Are they to be trusted?
LT1VetteGuy: 150shot?!?!?! no more no less?
I liked the sound that Nathan Plemons vette was making, so I think I will go for real hp, not just nos
/Mike
LT1VetteGuy: 150shot?!?!?! no more no less?
I liked the sound that Nathan Plemons vette was making, so I think I will go for real hp, not just nos
/Mike
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: LT1 to LT4 upgrade kit? (SlowGedda)
You dont need to buy any heads or intake manifolds, you merely need porting of the stockers. So you can use people like MORE Performance to do the portwork.
The only things you need to buy are the LT4 hotcam kit and the longtube headers, then whatever catback system you like based on sound preference.
Dont go buying pistons, rods, etc or a SC until well after youve decided to dig into the motor. You have to be patient and make up a plan, then stick to it (barring repairs).
The only things you need to buy are the LT4 hotcam kit and the longtube headers, then whatever catback system you like based on sound preference.
Dont go buying pistons, rods, etc or a SC until well after youve decided to dig into the motor. You have to be patient and make up a plan, then stick to it (barring repairs).
Race Director
Joined: Feb 2003
Posts: 11,672
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From: Lake Wylie SC
Re: LT1 to LT4 upgrade kit? (vader86)
Yes, you can trust More Performance. They have done some very nice work on several Vettes in our club. Mike, the owner, was a NASCAR engine builder and decided to go public with his talents. The shop is super clean and the work is right on the mark. Those horsepower ratings were taken from his dyno and are crank horsepower numbers.
I totally agree with Vader when it comes to building a plan before you buy anything. Remember, buy things that are proven to work together. That's why it is better to buy a package. Do you have a good machine shop over there? Have your block bored and go with a stroker.
I, too, thought it would be a good idea to go with the GM LT1 to LT4 kit. That way if I wanted to, I could replace everything so the numbers matched. But, this won't give you your desired 425 at the wheels. If money is not an obstacle, go with a top end package and look at a Pro Charger supercharger. But match the cam to the blower.
I totally agree with Vader when it comes to building a plan before you buy anything. Remember, buy things that are proven to work together. That's why it is better to buy a package. Do you have a good machine shop over there? Have your block bored and go with a stroker.
I, too, thought it would be a good idea to go with the GM LT1 to LT4 kit. That way if I wanted to, I could replace everything so the numbers matched. But, this won't give you your desired 425 at the wheels. If money is not an obstacle, go with a top end package and look at a Pro Charger supercharger. But match the cam to the blower.
Burning Brakes
Joined: Sep 2003
Posts: 1,214
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From: Miami FL
Re: LT1 to LT4 upgrade kit? (mackeyred96)
Here we go again... This LT1/LT4 kit was tested @425-429hp at the crank With long tube headers 52mm throttlebody and a custom chip.
If you port your LT1 heads you can get them to folw a little better than the LT4 but you could always port the LT4s in the futre. Plus you get the improved valves with the Lt4 heads. My guess is that all engines are a litte different but If this package was proven to be betwen 425/429 hp Anyone should get at least 400+ at the crank
If you port your LT1 heads you can get them to folw a little better than the LT4 but you could always port the LT4s in the futre. Plus you get the improved valves with the Lt4 heads. My guess is that all engines are a litte different but If this package was proven to be betwen 425/429 hp Anyone should get at least 400+ at the crank
Le Mans Master
Joined: Apr 2000
Posts: 5,713
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From: Manassas VA
Re: LT1 to LT4 upgrade kit? (vader86)
IMO if you are trying to beat a car running low 11's , you need more then a 350 hotcam motor. You could probably do the upper engine upgrade, ie LT4 heads, hotcam kit, headers, etc, and a big shot of Nitrous, but the pistons wont last long.
