TRUE TRUE!!!!!!

 

LT1s have more torque for their HP, LS1s have more HP for their torque. An LS1 will run the 1/4 at 13.5 or so but at like 105 to 108, this means they must have a better top end. An LT1 running that same time gains it in the 1/8th, a 13.5s LT1 will only be at like 103-106ish. LS1s still gots plenty of torque, but if you ratioed it I bet that an LT1 would have a better torque to hp ratio, which feels better in a heavy car like an fbod.

 

When my LT1 was bone stock with just a CAI, air foil, no cats, 3'' Flowmaster muffer, and my hurst shifter. I out ran a 98 SS Camaro. I think it had something to do with the driver but I still won.

I have also heard that the LS1's are better on Nitrous than a LT1 is for some reason. Anyone know why?

Now I will be the first to admit that you can take the same 2 cars, stock for stock, and one will be a better running car. A buddy of mine has a 2000 SS with just a HPP3. Now supposely the LS1's are underated at 325hp. Anyways, I ran him when I had about everything in my sig, except my computer programmer,AFPR, 3.73 gear, and of course I didnt spray him, and we ran side by side from a 50mph roll. From a dead stop I could launch better than him so I would win. Now with me having the computer and stuff we ran again and I pulled about a car length on him from 3rd to 4th gear.

Those LS1's are just insane. And if you get an automatic one, you can run some very good times with just a little nitrous. This one guy I know has a stock LS1 with just Borla catback, and one or 2 other small things and ran a 7.8 @ 94mph in an 8th. (on street tires)

 

The all aluminum aspect of the LS1 contributes to the improved ability to run nitrous. Aluminum is a better conductor of heat and can therefore dissipate it faster, which is good. Also, the bore/stroke has been changed/improved (Very long technical discussion, again do a search) which also adds to "nitrous reliability. The First 350 came out in 1967, aside from the aluminum heads and fuel injection of the LT1, there is very little difference (we wont go into the optispark).

 

Technical:

The main power differences between the two blocks is, as has been said, the top-end. You hear about the LS1's 15 degree heads dominating the LT1's 23 degree all the time. IMO, the power comes more from the port design than it does from the 8 degrees of valve angle (which really aids in placing the valves closer to the center of the cyliner). The LS1 heads are very tall compared to the LTs, and for good reason. This allows for very tall ports in order to give the incoming air a better approach angle at the valve. The less you try to manipulate air while it's moving, the more effeciently it will flow. LT runners have a pretty wicked bend in them as compared to the much straighter LS runner. The ports are also narrow which helps keep the velocity up with such tall runners.

The LT1 heads come with 170cc intake runners, LT4 195cc, and the LS heads have 215cc runners, which means the LS heads have more potential right out of the box.

One thing that really gets overshadowed by flow numbers is how the ports handle the inertial effects of the air in the intake. Air is a fluid and has mass like anything else, so it will have the properties of inertia and can also have momentum. The whole time your engine is running you have compression and expansion waves bouncing all around the intake (which a flow bench can't tell you anything about). This introduces intervals of high and low pressure in the ports (high pressure in front of the wave, vacuum behind it). The LS1 heads have equal port spacing which keeps the waves from one port from interfering with another port (unlike the SBC siamesed ports). Then look at port length and cross-sectional area: LS1 wins again as it uses these waves better to take advantage of the ram effect of the compression waves taveling back down the port towards the valve; and also better organizes the higher-speed and lower-speed airstreams as they approach the bowl area (less turbulance).

Of course, to disintegrate the LT1's disadvantages you have to either switch to the SBC heads or AFR's RR LT4s.

All of this is assuming you are running NA. When you begin to talk about boosting these engines, the LS1's advantages are not as great. The inertial effects aren't as important anymore now that the main restriction is the back of the intake valve and not the design itself. Instead of the piston and heads having to "coax" the air/fuel mixture into the cylinder (vacuum), it is being forced in. Air under pressure and air under vacuum act a good bit differently. In boosting, basically, you just want more port and intake volume, and bigger valves in order to promote cylinder filling(while in NA apps, these things play a much larger role). Under boost, the power differences between a 215cc LS1 head vs a 215cc "LT1" head with same size valves won't be that much, IMO. Then decide on where you want your peak power range, select a cam accordingly, and boost away.

There are many more aspects to look at, but I haven't gotten that far along in school yet. Mindgame, Rich, Chuck, etc. please critique me and make sure I'm getting this right.

That's my $.02

 

because the LS1's are built by god himself.....duh!!

 

belive it or not my lt-1 camaro has beat an ls1, with some bolt- ons like headers flow master and intake i managed it this past week i beat a 98 ss camaro the first time the 2nd time i spun and barely loss by a fender you guys figure i think the lt-1 is allot better with modification to it.

 

Catback LS1 runs 94mph in the 1/8th?

 

AS mindgame and others have pointed out, the head design is lightyears ahead of the LT1, as well as the intake manifold.
Keep in mind that when you start saying,"well if you do this, this, and this to an LT1, then they'll be equal" that you're biasing the situation big time....try doing all of the above to both the LS1 and LT1 and see where you're @.
Haven't heard of many stock bottom end, stock casting LT1s getting into the mid 10's....on the other hand I can count off 4 LS1s doing that right here in Orlando.
From the factory, the LS1 produces a good 50-65 more Rwhp, regardless of advertised claims.