Stock Specs of LT1 and LT4

info gathered from LT1Engine.com


Block Specs
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
Factory Camshaft Specifications:
1992 Y-body: 205/207 0.451/0.450 lift 117 LSA
1993-1995 Y-body, F-body: 202/207 0.450/0.460 lift 116 LSA
1994-1996 B-bodies (including L99 4.3L): 191/196 0.418/0.430 lift 111 LSA
1996 Y-body, 1996-1997 F-body: 200/207 0.447/0.459 lift 117 LSA
1996 Y-body, F-body LT4: 203/210 0.476/0.479 lift 115 LSA

holy crap...

There are a couple of little tweaks that can be made to a couple of specs which differ from what I've read on another site.

Right now I don't know which info is correct, the info here or the info on grandsportregistry.com. Little stuff like the cam specs for the 96 LT1 'Y' body.

Just trying to help.

Jake

Anyone know what accounts for the differences in HP and torque between the various models? With the LT4 or LT5 vs the LT1, the differences are obvious. But what is it about the Corvette LT1 that gives it 300HP vs 275HP for the pre-1996 F-body? Or what makes the 1996-1997 SS and the Firehawk have 30-40 more HP than, say, a typical 1995 Z28?

sales my friend!
would you pay the money for a corvette if the lesser price F-body had the same HP rating. As far as i am concerned the Lt1s are all the same, the vettes had true duals and lighter weight.
Now the GS vette and the 96 6spd models were Lt4s and you know the obvious differences.

Quote:

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Originally Posted by 96lt1m6

sales my friend!
would you pay the money for a corvette if the lesser price F-body had the same HP rating. As far as i am concerned the Lt1s are all the same, the vettes had true duals and lighter weight.
Now the GS vette and the 96 6spd models were Lt4s and you know the obvious differences.

---

So you're saying that, apart from the fact that the Vette LT1 has four bolt mains, the Vette longblock is identical to the F-body longblock? The Vette doesn't have a better cam, or anything like that?

Quote:

---

Originally Posted by StorminMatt

So you're saying that, apart from the fact that the Vette LT1 has four bolt mains, the Vette longblock is identical to the F-body longblock? The Vette doesn't have a better cam, or anything like that?

---

there were a couple H.O. cams.

http://en.wikipedia.org/wiki/Lt1_engine#LT1

Factory LTX Camshaft Specifications**:
1992 Y-body: 205/207 0.451/0.450 lift 117 LSA
1993-1995 Y-body, F-body: 202/207 0.450/0.460 lift 116 LSA
1994-1996 B-bodies (including L99 4.3L): 191/196 0.418/0.430 lift 111 LSA
1996 Y-body, 1996-1997 F-body: 200/207 0.447/0.459 lift 117 LSA
1996 Y-body, F-body LT4: 203/210 0.476/0.479 lift 115 LSA

thats some interesting stuff.....

Some other tweaks which could be mentioned:

LT4 compression is 10.8:1
92-93 LT1 is batch fired injection vs. 94-97 being sequential
Piston material is "Hyper"eutectic

Nothing too important, just tweaks.

Wow, awesome info!

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