also the ls1 has an advantage of being lighter. the lt1s have a cast iron block while the ls1s have an aluminum block, so right there is a difference. i dont know the exact weight difference, but it all matters. and yes, the lt1s came with 275 hp, and i do believe in 96 and 97 they were bumped to 285 hp. and correct me if im wrong, but i believe the ls1 was about 305 hp from factory.

 

well i knew the blocks was diffrent from iron to aluminum but i didnt know the ls1 was a 346 i thought they were the same block basicly besides the iron and aluminum....And the ls1 heads want work on a lt1?guess ya learn somthing new everyday.

 

but i will also say that aluminum is more prone to warping compared to cast iron...take that for what you will

 

I will stick with my LT1 for awhile I'm lookin at getting a LSX 454 or a 6.2l out of the new Camaro's

Block and Basics
Displacement: 350 cubic inches, 5733 cubic centimeters, 5.7 liters
Block Material: Cast Iron
Main Bearings: 2-Bolt Centers and Ends (The Corvette LT1/LT4 had 4-bolt mains)
Stroke: 3.48"
Bore: 4.00"
Compression Ratio: 10.4:1
Combustion Chambers: 54 cubic centimeters
Factory Redline Rating: 5700 Rotations Per Minute

Bottom End
Piston Material: (10159437) Eutectic Aluminum/Silicon Alloy
Connecting Rod Material: (10108688) Powdered Metal
Crankshaft Material: (12556307) Cast Iron

Top End and Valvetrain
Cylinder Heads: (10168448) Cast Aluminum, 2 valves per cylinder/16 valves total, ~212 CFM flow (Impala SS and Caprice heads were made of cast iron*)
Valve Diameter: (intake- 10241743, exhaust- 12550909) 1.94 intake, 1.50 exhaust
Valve Overlap: 41*
Valvesprings: (10206040) 85 lbs, seated
Camshaft Specs (12551705): 205/207 duration @ 50*, .447/.459" lift, 117 Lobe Seperation Angle
Rocker Arms: (10089648) 1.5:1 Stamped Steel
Timing Chain: (10128485) Powdered metal butt link

Intake and Fuel Delivery
Fuel Delivery: Electronic Fuel Injection, sequential port
Injector Size: (17124248) 3.0gps, 22lbs/hr speed density (1992-1993), 24lbs/hr mass airflow (1994-1997)
Throttle Body: 48 millimeter twin butterfly
Intake Manifold: (12552137) Aluminum

Factory Power Ratings
92-96 LT1 Corvette: 300bhp, 330lb-ft
1996 LT4 Corvette: 330bhp, 340lb-ft
1992 LT5 Corvette: 375bhp, 370lb-ft
93-95 LT5 Corvette: 405bhp, 385lb-ft
93-95 LT1 F-Body: 275bhp, 325lb-ft
96-97 LT1 F-Body: 285bhp, 325lb-ft
96-97 WS6/SS: 305bhp, 335lb-ft
93-97 Firehawks: 315bhp, 340lb-ft


LS1
General Specifications
Displacement 5.7L (5665cc, 346ci) Gross Horsepower 310 @ 5200 RPM, 320 @ 5800 RPM
Bore/Stroke 3.90/3.62 Gross Torque 340 @ 4000 RPM, 330 @ 4400 RPM
Compression Ratio10.1:1 Maximum RPM 6200
Firing Order 1-8-7-2-6-5-4-3
Out of crate weight. Approximately 390 lbs.
Spark Plug ACDelco 12 ACDelco 41-985 Spark Plug Gap .060”, 1.524 mm
Compression ratio:
10.25:1

 

i have learned that simple bolt ons will get you more power through the ls1 than the lt1,not by much but to me and what i have experienced over the years the lt1 is more reliable after you have put money into the motor

 

Very true I've been thinkin also about installing a Vortec Super charger with 12psi of boost. I've rebuilt a 98 LS1 it had a rod and bearing recall the bearing melt and the number 3 and 4 rod and bearings melt to either the crank or to the connecting rod plus had to bore the engine 0.020 over because of the wear the pistons did on the cylinder some mistake knocking sound it makes for rocker arms and timing chain wear

Also to mention the trust bearings wear changed from the rear in the lt1'S to the middle of the LS series

 

Advantages of LS1:

Efficiency
Better breathing
Less weight (nearly 50% less from what I've heard)
Better response to mods
Better top end power
(Again, from what I heard) better for high end projects.

Disadvantages:
Euro-V8 sound (lot of muscle car guys hate it, I personally don't mind it)
Higher cost of parts and modifications
The "fish-eye" front end (although some love it, I personally hate it)

LT1's advantages:

Cheap to buy
Cheap to mod
Bulletproof engine block
More torque available at lower revs (faster off the line)
Old school muscle car noise
Retains more of the original concept design for the 4th generation Camaro, therefore a better designed car (let me make that clear, that's a fact)

Disadvantages:

Opti-spark
Inefficient (I'm getting 14mpg with conservative driving)

Also, I'd like to correct one of the posts made above; a lot of under the hood LS1 parts are interchangeable with LT1s, although none of them are directly a part of the actual engine.

 

before i did any mods to my car it got 25 mpg on the hwy I drove it coast to coast one summer getting up to 390 to 410 miles to a tank of fuel, In the beginning too... I only had a stock transmission and 2.73 gear ratio

 

thats a crud load of mpg 410 miles on a 15 gallon tank is as good as most gas savers. in meh 6 speed of hit 33 mpg commuting to fernely from reno every day for a month. not bad

 

amir u have something wrong. u should be getting 25+ mpg. my last 93 i got in the area of 27mpg no matter how i drove it. this one i cant get it over 25 and still trying to figure out y.