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LT1-LT4 Modifications
1993-97 Gen II Small Block V8

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Old 05-12-2004, 07:06 PM   #1
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Lightbulb Basic LT1 Specifications

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

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


* Cast iron flows better, but holds heat a lot more than aluminum heads
** Thanks to Metalbeast for these specs

More info can be found here: http://www.automotiverebuilder.com/ar/ar99928.htm

Happy modding
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Last edited by enisguy; 12-15-2004 at 01:44 AM..
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Old 05-13-2004, 06:59 AM   #2
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Very nicely done...
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Old 05-13-2004, 02:37 PM   #3
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What about 58cc combustion chambers?
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Old 05-13-2004, 02:43 PM   #4
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Quote:
Originally Posted by dhdenney
What about 58cc combustion chambers?
Added
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Old 05-13-2004, 03:33 PM   #5
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Nice post!!!

I love my fellow LT1 Brothers...
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Old 05-13-2004, 03:39 PM   #6
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Quote:
Originally Posted by Mike TexaSS
Nice post!!!

I love my fellow LT1 Brothers...
We love you too Mike. We love you too.
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Old 05-13-2004, 03:41 PM   #7
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Might as well post LT4 power specs in there
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Old 05-13-2004, 03:47 PM   #8
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Quote:
Originally Posted by DietCoke
Might as well post LT4 power specs in there
Good call, I'll post the Corvette power specs in there. Forgot about them.
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Old 05-31-2004, 01:47 PM   #9
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96-97 LT1's were bumped up to 10.5:1 compression but im not sure how. Maybe different head gasket or something along those lines(Ill have to check part numbers), but anyways, thats just the specifications in the book. Very nice to have that list on here, thanks Enisguy!

ps. I dont know if you wanted to, but you could add the Impala stats as well, ie. nodular iron crank, cast iron heads with slightly different porting, etc.
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Old 05-31-2004, 09:24 PM   #10
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Don't forget you could get the optional exhaust on the SS to bump the power to Firehawk ratings.

90 was the first year of the LT5 (ZR1). It was 380hp I think. 91 dropped down to the 375hp rating.
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Old 06-09-2004, 08:04 PM   #11
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the cams were different for different years. for instance an obd2 cars cam is not the same as an obd1 cars cam. just something to asterix so someone doesnt bitch about it. the power ratings were the same so its no big deal really. the vette lt1 had 4bolt mains as well. the lt5 went up in power to 405hp in 91 i believe. it started out at 385 in 89.

good list though. very well put together. thank you for doing it
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Old 06-12-2004, 12:04 PM   #12
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Does anyone know the flow number on our stock 48 millimeter twin butterfly throttle bodys??
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Old 06-13-2004, 05:00 PM   #13
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Nice, I may have to print that out.

According to my Chilton's service manual, 93-95 F-Body LT1's have a 10.5:1 compression ratio though.
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Old 06-15-2004, 09:45 PM   #14
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Good post.
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Old 06-23-2004, 02:29 PM   #15
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Quote:
Originally Posted by Gangly
ps. I dont know if you wanted to, but you could add the Impala stats as well, ie. nodular iron crank, cast iron heads with slightly different porting, etc.
That would be nice to add
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Old 07-30-2004, 10:43 PM   #16
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my 94 is running 10.5/1 stock
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Old 08-06-2004, 03:38 PM   #17
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Quote:
Originally Posted by Gangly
96-97 LT1's were bumped up to 10.5:1 compression but im not sure how. Maybe different head gasket or something along those lines(Ill have to check part numbers), but anyways, thats just the specifications in the book. Very nice to have that list on here, thanks Enisguy!
factory specs on the heads were changed slightly (combustion chambers had a bit more edge overlap)
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Old 08-06-2004, 03:46 PM   #18
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Just wanted to add that the torque specs for the LT1 vette were 330 lb/ft for 92 only. The duration on the intake lobe was slightly lowered giving the 93 to 96 LT1s 340 lb/ft @3600 RPMS as opposed to 330 lb/ft @4000 RPMs for the 92s.
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Old 08-25-2004, 10:17 AM   #19
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Enisguy, here are the cam specs broken down by year for both LT1 and LT4 if you want to add it to the list:

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
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Old 09-04-2004, 12:21 PM   #20
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nice post, thats very interesting stuff
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Old 09-04-2004, 12:21 PM
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