Jump to content

what does LT1 and LS1 mean?

Kevin zellweger

Recommended Posts

SilveradoWV Senior Enthusiast

SilveradoWV

Posted
Posted

Your Vortec 5.3 is just that.

An LS1 is (Engine gas, 8 cyl, 5.7L, SFI aluminum engine) and an LT1 is (Engine gas, 8 cyl, 5.7L(5.7P), MFI, HO). Although the new Vortec engines (4.8, 5.3, 6.0) are LS1 based, they are not the same.

MarkD Senior Enthusiast

MarkD

Posted
Posted

LS1 is a 3rd generation 350-centerbolt valve covers

-synthetic intake

-introduced 1997 Corvette

-typically 300 rear wheel hp in an automatic car

 

LT1 is a 2nd generation 350-centerbolt valve covers

-reverse cooled (heads/intake first)

-introduced 1993 Corvette/Camaro

-typically 250 rear wheel hp in an automatic car

 

1st generation 350-perimeter bolt valve covers

scooter70 Enthusiast

scooter70

Posted
Posted
LS1 is a 3rd generation 350-centerbolt valve covers

-synthetic intake

-introduced 1997 Corvette

-typically 300 rear wheel hp in an automatic car

 

LT1 is a 2nd generation 350-centerbolt valve covers

-reverse cooled (heads/intake first)

-introduced 1993 Corvette/Camaro

-typically 250 rear wheel hp in an automatic car

 

1st generation 350-perimeter bolt valve covers

LT1 was first in the Vette in '92, F-body in '93. LS1 introduced in '97 Corvette, then F-body in '98. (The LT4 went into 1000 Camaros and all 6 speed Corvettes in 1997)

LS1 is all aluminum... block and heads (with the plastic intake manifold), LT1 was an iron block with aluminum heads and intake.

 

Yes, the new Vortec truck motors are similar to the LS1. There are some parts that are interchangable. SLP offers some speed parts for our trucks (ie cam, rockers, head upgrades) that are the same as the Corvette parts. LS1 is actually a 346ci (not 350). Different bore and stroke.

robsawatsky Enthusiast

robsawatsky

Posted
Posted

And LS1 and LT1 are the RPO codes for these engines. Look for a code starting with "L" on your RPO sticker in your glove box to find your engines code.

Rotorwrench Enthusiast

Rotorwrench

Posted
Posted

A cast iron head version of the LT1 was in Buick Road Master, Impala SS and police package Caprice from 94 (I think) to when GM stopped making this body style.

BCNU Enthusiast

BCNU

Posted
Posted

Scooter70 the LT4 was only one year in corvettes and that was 96 , all 6 speeds. The 97 model had LS1's. My freind has a yellow 96 LT4. Maybe a collectors item one day being they were only 1 year.

remberto Enthusiast

remberto

Posted
Posted
Your Vortec 5.3 is just that.

An LS1 is (Engine gas, 8 cyl, 5.7L, SFI aluminum engine) and an LT1 is (Engine gas, 8 cyl, 5.7L(5.7P), MFI, HO). Although the new Vortec engines (4.8, 5.3, 6.0) are LS1 based, they are not the same.

the "westers PCM" post made me think of your post and wanted to bring up the quote from it:

 

All 2003 GM trucks

4.3L L35 V6, 4.8 LR4 V8, 5.3L LM7 V8, 5.3L FFV V8, 5.7L L3 V8, 6.0 LQ4 V8, 6.0L LQ9 V8 and 8.1L L18

 

these were taken off of the wester garage site but it seems to be a listing of the different designations. would you agree?

01Burb Enthusiast

01Burb

Posted
Posted

LT1 in the Vette was 300HP. The LT4 I think was 330 and appeared primarily in the 1996 Grand Sport although it was available in regular Vettes.

americanmuscleman Enthusiast

americanmuscleman

Posted
Posted

Most everything is correct above.

 

LT1: 92'-96' Corvette, 93'-97' F-body, 94'-96' Impala SS, and various Buick Roadmasters and Caprices. The Impala SS, Buick Roadmasters, and Caprices all had cast iron heads and were rated at 260hp, 335tq. The aluminum headed F-bodies were rated at 275hp, 325tq from 93'-95', and 285hp, 325tq from 96'-97'. The corvette was rated at 300hp, 340tq from 92'-96'.

 

LT4: 96' Corvette in regular trim or with the Grand Sport package. It was only available with a 6speed. It was also an option on 97' Camaro SS's and 97' Firehawks. Supposedly 106 Camaro SS's were built with the LT4 (100 in US, 5 in Canada, 1 test vehicle... and 29 Firehawks in US.)

 

LS1: 345hp, 350tq in 97'-Present Corvette, 98'-02' F-body 305-345hp, 325-350tq depending on SLP options.

 

LS6: 385hp,385tq in 01' Z06 Corvette, 405hp, 400tq in 02' and newer Z06 Corvette.

MarkD Senior Enthusiast

MarkD

Posted
Posted
LT4: ... Supposedly 106 Camaro SS's were built with the LT4 (100 in US, 5 in Canada, 1 test vehicle... and 29 Firehawks in US.)

I actually sat in a '97 LT4 SS at a car show I was in with my '97 LT1 SS

americanmuscleman Enthusiast

americanmuscleman

Posted
Posted
LT4: ... Supposedly 106 Camaro SS's were built with the LT4 (100 in US, 5 in Canada, 1 test vehicle... and 29 Firehawks in US.)

I actually sat in a '97 LT4 SS at a car show I was in with my '97 LT1 SS

I've never had an opportunity to sit or ride in one, but I have seen one run at the track before. This guy ran a couple passes in it with his best being a 13.2 @ 108mph. It was a fairly warm day, so I'm sure with nice weather it could even eek out a little faster time.

 

I've seen a 96' LT4 vette run as well (not a Grand Sport), and it ran a 12.9 @ 110mph. He raced a 99' 6speed FRC (fixed roof coupe, like a Z06) and it ran a 13.2 @ 107mph.

 

I think those LT4's are underrated. I think they made 350-360 flywheel hp.

scooter70 Enthusiast

scooter70

Posted
Posted
Scooter70 the LT4 was only one year in corvettes and that was 96 , all 6 speeds. The 97 model had LS1's. My freind has a yellow 96 LT4. Maybe a collectors item one day being they were only 1 year.

D'oh. I mistyped. Dad had a Collector's Edition 6-speed a few years ago. Yes, that car was fast. Not quite as fast as the LS1, but those LT4 heads deifinitely made a good 50hp more than the LT1s. (He traded the '96CE for an '00 Milenium Yellow coupe in 2001). I've logged a few miles in that car, including a trip to the top of Mt Washington. Let me tell you... 350hp going to two fat rear tires is scary trying to go up the narrow, dirt mountain road up to 6200feet.

 

(Oh, and I was a little off on the LT4 Camaro #s too. My bad.)

OUMike Senior Enthusiast

OUMike

Posted
Posted

LT4 Corvettes will compete with LS1 Vettes. The LT4 was built to replace the all mighty DOHC LT5 motor. The LT5 engine was discontinued in 1995 due to emissions. The emssions laws in the US changed just slightly and GM didn't want to sink any more money into the LT5 to make it 96' complient. 50 1996 LT5 motors were contstructed. They were 450 hp. The engines were literallly hit with sledgehammers and thrown away. A market for a high performance Corvette was still there, so GM built the GS. The GS was given ZR-1 wheels (only black) and tires. You'll notice the fender flairs on the rear of the GS to make up for the extra 3 inches in body width. Corvette GSs are VERY underrated. 330hp was the number givin' to them, but I've personally seen stock dyno's that indicated about 355 (corrected) hp. The LT4 was also installed on Corvette CEs, but only the 6-speed version. All 96' autos were LT1s. I miss the ZR-1...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,746
    Total Members
    8,960
    Most Online
    J.P.L
    Newest Member
    J.P.L
    Joined

  • Who's Online   6 Members, 0 Anonymous, 393 Guests (See full list)

  • Latest Articles

  • Posts

    • Black02Silverado
      Missing thrust bearing? And oil selection

      By Black02Silverado · Posted

      Maybe, but it seems he is the only one that has backed up data to prove what he is stating. I think he is doing this more because he enjoys it and wants to get the information out to us. He's got the knowledge and access to the proper equipment and having the funds doesn't hurt.  I would love to do what he is doing and would do it if and when I hit the Powerball.  I'm not a Tribologist by any means but love to learn what I can.   I would bet there would be doubting people out there if a completely independent lab with high quality work and highly respected in the automotive industry, put out information like this.  The world can't be pleased, one just has to take the information that they are given, do more of their own research to find actual lab data to back up what they are trying to figure/find out.  Most don't bother, they just want to believe what they first see.     I don't have the minimax but my 6.2 in my 2019 Silverado with 64k miles shows excellent UOA results with 0w-20 and for my own purposes 5w-20.  Since not much of a change using 5w. I liked the data sheet information on the SS 5w-20 and figured I would give it a try.  Still the same viscosity at 100℃.   In the end we all just do what makes us happy, life is too short to get upset over trivial social media.   On a side note, I do feel GM has dropped the ball and just cares about the bottom dollar and not quality anymore.  "Like a Rock" has been long gone.  Seems "Built Ford Tough" has as well.
    • Tyler Gibbs
      Thoughts on these wheels?

      By Tyler Gibbs · Posted

      Better than stock but that's like putting lipstick on a pig
    • flattop
      2026 sierra bad brake controller

      By flattop · Posted

      Hello, my 3 month old Sierra Elevation wont recognize a trailer with electric brakes? All the lights work correctly, but no power to the brakes?   This is the factory installed brake controller. If you manually push the knob, the display shows the power % but does not light up like my 2022 silverado.   I have an appointment with the dealer, but was checking to see if anyone else has seen this issue.    Thanks, 
    • Black02Silverado
      Post your latest oil change.

      By Black02Silverado · Posted

      Been using SS 0w-20 from new, but wanted to change to the 5w-20 because I liked the data on the data sheet, to me it seems like a little better product. But as you can see, not much difference. This is also with running a mix of 10 gallons E85 to a tank topped with 93. It isn't a flex fuel vehicle so any higher I get a CEL for running lean on both banks. Yes my mileage takes a hit. Instead of 20 mpg I normally get on trips I get 17mpg. This is also using EaO17 filter.  What is amazing is I have the AMSOIL cone filter on it since I have the GM Performance intake installed and that air filter has 44k miles on it.  I just take it out and shop vac it off once a year.  I use the upholstery tool on my shop vac.  Works well.   
    • revmanii
      Starting a new thread regarding mounting my 2014 OEM wheels to my 2026

      By revmanii · Posted

      So, lot's of googling and reading, and a trial fit found, that indeed they hit the newer fatter caliper. I did some re-testing today, and found just 3/16" worth of washers was enough for the wheel to spin freely. I added 2 more on each, and again it spun freely. Tested lock to lock with the 4 washers, about 5/16" not quite the 3/8" Im considering, but pretty close. No issues. I've been looking at the BORA .375" spacers and using extended lugnuts to get back lost thread due to the spacer. All the ET lugs I've seen are all .33" reach inside the wheel lug holes. For those that don't like spacers or think they're unsafe, I think it depends on what type of spacers you're using and making sure you get good quality hubcentric ones, and if you're using bolt on ones, regular mainenance, checking the spacer lugs. Not wanting or needing that much spread. Looking for the minimum that will let me run these rims and tires.  it does look to stick out a little, but I really want put these on. and use the stock all-terrains in the winter. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...