What is the difference between the two motors? Like hp, trq, and all the other goodies. All i know about them is that they are in corvettes.

Both motors came in the Corvette and Camaros (Impala SS' had the LT1 also). Ratings for both motors varied during the years produced.

The LT1 came first was rated approx. 275hp for the LT4 version. It's a great motor that has an almost flat torque curve. Very seat-of-the-pants fun to drive. While they can be built up in HP it's quite as easy as an LS1. The LT1 is an iron block and came with iron or aluminum heads depending on the car it came in. The biggest problem it had is with the Opti-spark, this is its version of a distributor. Its mounted right behind the water pump and driven off of the camshaft for timing purposes. The problem is when the water pump goes bad it leaks right onto the Opti. Water + electrical item... you get the idea.

The LS1 was rated about 350hp (405hp for the LS6). A big jump in motor technology. It's been said that you can get an LS1 to make more power just by staring at it. :lol: It will take modifications and give you HP in return, typical heads/cam will give you 400 rwhp with computer tuning and still pass smog. Most LS1s increased in HP without mods after about 5000 miles when it was broken in. The LS1 also has 8 coils on it, 1 per cylinder. Aluminum block and heads.

Thanks for explaing it to me. The biggest difference I really only see is that one has an iron block and the the other has a aluminum block. and the LS1 block has the coils on each cylinder which is very awesome!

Comparing the LS1 to a LT1!!! You might was say the only difference in the engines was one is a Ford or something. The LS1 or genIII for that matter is the greatest engine ever built by anyone. Whether it be the LS1/Z06 aluminum version or the LQ series of truck engines these are unreal. Beside the fact that the the crank is now damn near suurounded by the block making darn near bulletproof and that you can get another 50 horse or so by simply "tuning" it properly, these respond to cam/head/intake mods like no other engine ever has. It is not at all uncommon to see 600+HP that are very streetable and idle under 1000RPM. LOTS of guys are getting over 1000rear wheel HP...thats over 1200HP (turbo and supercharged versions) with a 346cubic inch small block that weighs less than a pair of B/B heads. Some of those guys even drive on the streets 8O Another neat thing is that the 4.8, 5.3, 5.7, and 6.0 are almost totally interchangable. Crank mains are all the same, cyl heads will interchange, cams, intake plenums, injectors, accessory drives etc.. so just cause you have a vette doesn't mean you have to pay the wreckers for "vette" parts. you can just tell them you need some 3/4 ton truck parts (yeah guys I know, the older sm blk interchange too, it's just rare to see late model stuff so versatile). Also, the bellhousing pattern is the same so older transmissions will fit.

Dennis I agree that the LS1 is a great smallblock Chevy engine but what about the LT5, what? is it chopped liver?

Yep, anything that costs 25K for a long block that you can't even find 5 years after they stopped production chopped liver. I've got a few customers that hord the ZR1 stuff, even broken parts. They figure it's easier to fix a broken part than pay to have new ones custom built. Nice engine, just too much money.

You're right of course Dennis--but you have to admit that in any history of the great smallblock Chevy engines of the late 20th Century the LT5 wll get more than a honorable mention. Chevrolet went way beyond what they had to do to create an awesome motor but of course in the scheme of things the LS1 is a far more significant engine.

Just wait for the LS7!

Oh, sure. Gotta bring out the LS7 teaser. :P

7.0L 500-550Hp is the current story. Can't wait for January when the new Z06 debuts.

to be truthful, the ls1 is a great engine, but dont you wish that chevy would not have gone backwards in technology? The lt5 is a DOHC v8 that made 405 hp, and that was in 93. if chevy would have perfected that technology, i believe engines would be more powerful than the ls1 and upcoming ls2.

True but emmissions have gotten tighter since the LT5 so I don't know if it would have the same HP if it was built now. Also GM didn't build the LT5, it was outsourced to Merlin or Mecury or someone like that. GM guys couldn't even work on it because it was so complicated. If there was a problem with it, any problem, the solution was to pull the motor, ship back to the manufacturer and reinstall it when it came back.

Personelly I'm waiting for the camless motor. That will be a very 8) motor.

Well the LT5 was of course the highmark Chevy smallblock engine (R&D was done by Lotus and manufacturing was done by Mercury Marine) and if Chevy had continued to develope it there is no doubt it would be on the high side of 500hp today, but it was just too expensive to justify when the LS1 is nearly as powerful for a lot less money. To me it was amazing that Chervrolet ever made such an engine available if even only for a few years.

FYI Mike, the LS1 makes more than 405 out of the box. Any competent tuner can squeeze it to 450 totally stock with no problem. Here are some specs on the LS7:

Engine Development by KaTech
To be hand built by new HP Engine Plant

LS7 427ci/ 7.0L. 500HP/500 Ft Lbs (512 HP derated to 500HP)
- 2 OHV (3 OHV not necessary for target HP)
- Raced based CNC ported Aluminum Head with 70cc chambers
- 11.0:1 CR
- 46 mm (1.81") Titanium Intake valve
- 41 mm (1.61") Na filled Exhaust Valve
- 104.8 mm Bore (4.125") , 101.6 mm Stroke (4.0") Aluminum block
- Forgrd Crank
- Forged 6 bolt main Bearing Caps
- Titanium Rods
- Cast Aluminum Flat Top Pistons
- 0.591" Lift Cam (15 mm)
- Dry Sump
- 90 mm Throttle Body on Composite manifold
- Ram Air

and this is detuned as well, we'll see how much the "tuners" can get out of it stock. I'm guessing with heads and cam this will see the high side of 600HP no problem.

FYI Mike, the LS1 makes more than 405 out of the box. Any competent tuner can squeeze it to 450 totally stock with no problem. Here are some specs on the LS7:

Engine Development by KaTech
To be hand built by new HP Engine Plant

LS7 427ci/ 7.0L. 500HP/500 Ft Lbs (512 HP derated to 500HP)
- 2 OHV (3 OHV not necessary for target HP)
- Raced based CNC ported Aluminum Head with 70cc chambers
- 11.0:1 CR
- 46 mm (1.81") Titanium Intake valve
- 41 mm (1.61") Na filled Exhaust Valve
- 104.8 mm Bore (4.125") , 101.6 mm Stroke (4.0") Aluminum block
- Forgrd Crank
- Forged 6 bolt main Bearing Caps
- Titanium Rods
- Cast Aluminum Flat Top Pistons
- 0.591" Lift Cam (15 mm)
- Dry Sump
- 90 mm Throttle Body on Composite manifold
- Ram Air

and this is detuned as well, we'll see how much the "tuners" can get out of it stock. I'm guessing with heads and cam this will see the high side of 600HP no problem.

8) 8)

I want one for my Camaro. Where's the burnout smiley when you need it?

Poltergeist,
any kind of compressed air engine to open the valves (pneumatic valves) will be awesome. can you imagine the tuning to go with that. You can say one day, "i only need 100 hp to commute to work" and then the next, "time to hotrod the car on the open road" with probably the flick of a button. with compressed air opening the valves, tuners can have whatever "cam" profile the want at any given time.

Actually what everyone is using on the prototypes are electric solenoids. The problems they are having is with longevity of the solenoids. Also the electrical systems need to be 36 or 48 volt. The great thing about this motor is with the computers the motor can automatically adjust the HP for you. Crusing on the freeway it will give you 40 or 50 hp (if that) to maintain a constant speed. Floor it and now the computer can give you a cam profile that gives you a 500hp+ kick in the butt for acceleration. Just imagine a Corvette that can get 70 or 80 mpg and run the 1/4 mile in 11 seconds bone stock from the factory. 8)