LS1 or LT1

[turtle]

Just wondering which one you guys think is better

[01SS346]

Ls1

[00MysticZ]

back in th eday LT1 but now LS1

[turtle]

I don't have alot of experience with the Ls1's, actually I have no experience with the Ls1's so this is probibly gonna sound stupid(but I'll ask it anyway). What makes the Ls1 so much better?

[besz28]

well i have an lt1 and love it however stock for stock the ls1 is a better engine. heads flow pretty awesome stock. no dreaded opti.people here in florida have gotten a lot of hp on a very aggressive cam and stock heads close to 400rwhp. it's newer better technology.

[S-friggin-S]

00MysticZ said:

back in the day LT1 but now LS1

ditto

[turtle]

So what you're saying is pound for pound Ls1's are far superior to the Lt1's, stock or modded( my whole world is crashing down .....JK). Well anyway, so far Ls1...4 Lt1...0. Lets hear some more opinions people( like, the Lt1 is the best motor ever made...... the man who invented the Lt1 is a geinus..... the Lt1 can cure cancer..... Lt1's fight globel warming). Kidding, I'm just Kidding(no I'm not), obviously Lt1's don't cure cancer or fight globel warming(yes they do), just give your honest opinion on the subjet. Oh and please be truthfull, remember people rely on this message board to give honest information about the subjects presented here and the questions asked. Dave

[97SprChrgd383]

Ls1's are superior to lt1's. Like people say, just put a cam in a stock ls1 versus a stock lt1, no contest. But, I have an lt1, with a few mods, that would eat up a ls1 anyday. My tag is gonna say, "SS-THIS". That's awesome. You can see my mods at cardomain.com/id/thatguyscamaro. I'm just used to lt1 cause I've never had a ls1. I also like the deeper growl of the ls1 compared to lt1. They just sound better, stock that is.

[turtle]

Yeah but wich one has the greater potential for power gains for the least amount of money?

[97SprChrgd383]

Well, to buy a ls1 f-body is way more expensive than to buy a lt1 vehicle. The ls1's are better for taking just a few mods and getting a lot of hp out of them. The lt1's are way cheaper, so you could take the left over money you would have paid for a ls1 and use it for big mods to get alot of hp out of it.

[AAron]

LS1s are a little more expensive to modify. but the big thing is that the LT1s sound way better. ;D

[N20Dave]

To answer your question directly, the LS1 has more power producing potential in it's stock form for one reason, heads. Lt1's use a standard 23 degree valve angle for the intake valves. LS1 use a 15 degree angle. The more upright angle produces greater flow due to the straighter shot into the chamber plus it unshrouds the valves. A stock LT1 head flows around 210 cfm intake while an LS1 is around 240cfm. Fully ported an LT1 would be hard pressed to crest 300cfm and usually are around 270 - 280cfm while LS1 and LS6 casting heads regularly see 330+cfm. The architecture of the blocks really has nothing to do with it. Stick a 15 degree head on an LT1 and with proper cam selection, you'll get the same results.

[turtle]

N20Dave said:

Stick a 15 degree head on an LT1 and with proper cam selection, you'll get the same results.

Does that head and cam setup exist? Just wondering.

[N20Dave]

Combinations like this do exist but not in the traditional sense. You have to do some modification and then spend big money on associated components. There are no "exotic" valve angle heads made for the reverse cooled LT1 block right from the manufacturer that I know of. However, any sbc head can be converted for reverse cooling for under $400. The expensive part of the 15 degree and 18 degree stuff is the hi dollar valvetrain parts needed like shaft rockers, custom lifters and pushrods etc... Brodix makes an 18 degree head that accepts standard 23 degree valvetrain components though and that would be an excellent choice. The bottom line is that the LT1 wasn't around long enough for aftermarket companies to have the market to invest in exotic parts for them. That leaves us to be created. For instance, I'm building a street LT1 right now with 11 degree SB2 heads that I garantee no LS1 except the most race oriented piece will be able to touch n/a. The catch is that If I told you what I've spent doing it you'd have a heart attack.

[turtle]

N20Dave said:

That leaves us to be created. For instance, I'm building a street LT1 right now with 11 degree SB2 heads that I garantee no LS1 except the most race oriented piece will be able to touch n/a. The catch is that If I told you what I've spent doing it you'd have a heart attack.

Your Probibly right( I'm finance challenged), but if it will get our LT1's to spank an LS1 than I'm sure we would like to Know what it takes(money wise that is).

[besz28]

their are ls1's at my local speed shop here in tampa that have just added an aggressive cam longtubes and some bolt on's hitting almost 400rwhp.my lt1 with just about every bolt on you can do,ported polished heads that flow 277ish put down 394rwhp not bad, but those ls1 heads are so much better stock than out lt1 heads.

[LS1MightyMouse]

If you open up the heads on an LT1 and put in the 28lb injectors like the LS1's have. You will be makin the same power as them.

['68SuperchargedLT1Camaro]

N20Dave said:

To answer your question directly, the LS1 has more power producing potential in it's stock form for one reason, heads. Lt1's use a standard 23 degree valve angle for the intake valves. LS1 use a 15 degree angle. The more upright angle produces greater flow due to the straighter shot into the chamber plus it unshrouds the valves. A stock LT1 head flows around 210 cfm intake while an LS1 is around 240cfm. Fully ported an LT1 would be hard pressed to crest 300cfm and usually are around 270 - 280cfm while LS1 and LS6 casting heads regularly see 330+cfm. The architecture of the blocks really has nothing to do with it. Stick a 15 degree head on an LT1 and with proper cam selection, you'll get the same results.

Dave is absolutely correct. The 23 degree cylinder head design is what keeps the LT1/LT4 behind the LS1/LS6 in terms of maximum power potential. Because of its heads, the LS1 is a great motor. This doesn't mean that the LT1 is out of the game though. You can still make good power with a 23 degree head. The LT1 is also much cheaper to build.

Raymond

[N20Dave]

Turtle, I feel your financially challenged pain (people think I'm made of money when I tell them about this project but the truth is I'm not, just good at talking other people into sponsoring the project. I have spent everything I and my dad have however).

By the time we're done, nitrous setup and all we'll have over $20,000 in the motor. Bear in mind we sold a wad of parts from last year, probably like $9000 worth and got some sponsorship. If not I wouldn't be doing this.

[N20Dave]

68SuperchargedLT1Camaro link=board=lounges&thread=1115787362&start=17#1 date=1116819700 said:

Dave is absolutely correct. The 23 degree cylinder head design is what keeps the LT1/LT4 behind the LS1/LS6 in terms of maximum power potential. Because of its heads, the LS1 is a great motor. This doesn't mean that the LT1 is out of the game though. You can still make good power with a 23 degree head. The LT1 is also much cheaper to build.

Raymond

Right on the money Ray. And people take note here, as Ray already knows, there's nothing that can make your day better than a little positive manifold displacement. If you've got heads that are close, adding boost can even things out to some degree. I'm sure Ray's motor feels plenty darn strong.

Case in point. My last car was a 94 formula (I still have it waiting for bigger and better things although it's minus quite a few parts) with a mildly built LT1 short block, GM forged crank, Eagle H-beams, SRP's. Nothing too fancy, just solid reliable parts. It had dead stock LT1 castings, I mean not even port matched. Here's the key. The block was zero decked and had 11-1 compression. It had a P600B with a front mount intercooler making 15lbs of boost. Tune was done right with 42lb injectors and no fmu. It made 546 rwhp. I stunned more than a few LS1's. The car went 10.98@127 before I hurt it. Boost = Good!

[97SprChrgd383]

It would be kind of hard though wouldn't it? To modify the heads or find heads that are already setup like that?

['68SuperchargedLT1Camaro]

97SprChrgd383 said:

It would be kind of hard though wouldn't it? To modify the heads or find heads that are already setup like that?

I'll assume that your inquiring about using a 15 degree cylinder head on an LT1.

I know that Brodix makes an 18 degree, first generation, small block Chevy cylinder head that uses standard 23 degree valvetrain parts. These heads can, and have been modified to work on an LT1. If you would like to do something like this, you'll need to find a good machine/engine shop to make this work. It won't be cheap either.

Raymond

[97SprChrgd383]

So if it wouldn't be cheap to machine the heads to fit the lt1 to get the same power as the ls1, it's safe to say that the lt1 would be better for upgrading to get better power like the person asked at the beginning of this thread?

[N20Dave]

That's true, however, the LT1 will cost more for the same power increases to apoint than the LS1.

[turtle]

N20Dave said:

That's true, however, the LT1 will cost more for the same power increases to apoint than the LS1.

So what your saying is that once we get past the cost of getting better heads on our LT1's, they're cheaper to upgrade than the LS1. I guess what I'm asking is at what point does the LT1 become more cost effective than the LS1? Dave.