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what does LT1 and LS1 mean?


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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.

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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

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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.

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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.

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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?

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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.

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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

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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.

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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.)

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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...

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