SIXFOOTER

Concidering stepping into the new milenium
Been shopping ebay, used engine/tranny packages out there from $1000 to $5000. What is the diff between LSx and LTx, 1, 2, 3....6?
Very confusing

TIA

Eddie 70

I just jumped in and bought one Wednesday morning and am on my way to pick it up Saturday morning. I wound up getting an LS1 out of a 2002 SS Camaro with 22k miles on it. Basically the LS1 is the first version of the LS motor to come out in the C5 vette. The next version for corvettes was the LS6 in the Z06 vettes. Then in in 2005 the LS2 version came out in the corvette. The new LS7 is a dry sump 427 505HP version of the motor.

The LS1 LS6 are all 346 CI motors.
The LS2 I am not sure of its size but is 400HP.

There are lots more different engines than this, but this is mainly what I was after. Hopefully someone will chime in about and explain more about the differences.

SuprJames

There's also the LT1 and LT5 which is an earlier EFI motor using basically the same 350 c.i. block found in most C3's. If you're going to get a newer engine, go with the LS's. Otherwise it just won't be worth the trouble IMO.

Shirley1978

not sure about the ls1 but the ls2 is a 6.0... i wanna say ls1 is a 5.7 but im not sure..

zwede

LT1: Gen II smallblock introduced in the C4 in 92. F-body in 93. 350 CUI. 300 hp in C4, 275-285 in F-body. There was also an iron head LT1 for B-bodies (Caprice, Road master, Fleetwood).

LT4: Better heads, cam. Rated 330 hp in '96 C4.

LT5: DOHC all-aluminum for the C4 ZR1. 385-405 hp (I think)

LS1: Gen III small block. 346 CUI. Introduced in the C5 in '97, f-body in '98. All aluminum. 345 hp in C5, 305 hp (underrated) in f-body.

LS6: Same as LS1 but better heads, cam, intake. I think ~400 hp. Came in C5 Z06.

LS2: Introduced in '05 for the C6. 400 hp, 6-liters. Evolution of the LS1.

LS7: Super duper version of the LS2. Dry-sump oiling, 500+ hp, etc. Comes in the C6 Z06.

yellow01

Zwede has most of it. I'm a C5 guy lurking and considering a C3...

LS1 was 345hp/350tq previous to 2001, then went to 350/375 in 2001 on. 5.7L. So a later LS1 is torquier

LS6 was 385 in 2001, then went to 405/400 in 2002. 5.7L, different heads and block (port shapes changed), different cam, different pistons, increased compression

From 2002 (I believe) on, LS1 and LS6 shared same intake manifold, all other differences stayed different.

72LS1Vette

Some late 2001 and 2002-up LS1s have the LS6 block in addition to the LS6 manifold. My son checked the casting number on our 2001 LS1 block and it is a LS6.



Rick B.

Rick B.

71white

What auto trans will bolt to the LSxx

dgruenke

I think I read someone on here that the LSx out of the F-body's are easier to install in the C3 because of the pully locations.

Any truth to that?

PatsLs1vette

Most trans will mount up,turbo 350,400 700r4 4l60e etc... im using a 700r4 behind mine.

mrvette

Other than a 100 lbs? weight savings, which really is not all that much, just perzactly what does a LSx series engine bring to the table for ME, a hotrodder after max bux/effectiveness.....I am intriegued by maybe another 50 hp,and more torque....my late roller SBC with aluminum heads L98 type olde stuff should make about 375-400 hp, so I am told....well lets say it's 360 hp on a good day....cold weather, and so forth...not available in Florida, I know...so humor me....

with that power level what are the capabilities in Fuel Economy and so forth for similar power levels...do the LS do??

PatsLs1vette

Gene,The ls power pulls alot different then the lt or tpi motors,on a good day a tpi can pull 5500 the ls motors surpassed that with no problem at all.The way they feel while cruising and hammer it down pulls way different then the tpi motor.Theres power in every gear,even in overdrive just cruising at 55 nail it and it just goes,.There just better.

Eddie 70

I cannot wait to install mine. I have all the accessories torn off of it right now for clean up. I am thinking I may step up on the cam a little and possibly heads too. I drove my buddies 02 Z06 and it was nothing like what the current motor is in my vette. One thing I do know is the firing order has changed on the LS1. Just when I thought I had the Chevy firing order almost memorized......

easyasone2three

Yep, thats right. They accelerate and they keep accelerating until you let off. Great motor. The LS series will end up, if they are not already, as the best production motors that GM has built.

I got a nice running 72 454 and love it but the new technology in the 01 - well, no contest. And these engines have a ton of potential for huge increases in power for relatively cheap.

LS1 = 5.7L 346 CI
LS6 = 5.7L 346 CI increased HP for Z06
LS2 = 6.0L 364 CI for 2005
LS7 = 7.0L 427 CI for 2005 Z06

There is also the LS-6 and LS-7 (with hyphen) which are the old 454's from the early 70's like mine.

Wonder how a LS7 would fit in a C3?

yellow01

Wow that's a big surprise! I thought the port shapes were different on the blocks.

Cool

yellow01

Block size is the same as previous LSx's, but you'd have to find a place for all the dry sump hardware...

mrvette

Same as all the rest of older GM's....7218,4365....simple really....

alternate the 4 corners, then alternate the 4 centers....

wonder how many of you think the engine allways fires #1 cyl upon startup???

PatsLs1vette

Here you go

IGNITION SYSTEM


Each coil is located near the spark plug for high ignition energy, which results in more efficient combustion and better performance.
The electronic spark timing signals for the coils originate from the crankshaft and camshaft position sensors enabling high-accuracy spark delivery and misfire detection.
The firing order of the LS1’s ignition is also new. The new sequence is 1-8-7-2-6-5-4-3, whereas past small blocks had a 1-8-4-3-6-5-7-2 firing order. This was done for better idle stability and reduced vibration.

mrvette

I hear you Pat, that 4-7 switch in firing keeps the 5-7 adjacent cyl firing more evened out....and of course the separate exhaust passages spread out over the head is better also...no super hot spots....

but on that firing order thing.....expressed differantly....72184365, or 4 corners....7218, then 4 centers 4365.....

the LS does the same thing just slightly differantly from what you said above.....4 corners, 4 middles....



BTW, some 15 years ago when putting DPFI on my 455 Poncho engine alone in my garage...with help from a tig welder friend.....I figgered out the true firing order.....4 corners, 4 centers...it was a batch fire engine, and it changed my thinking a bit....