Difference in 92 and 94 LT1
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From: Baytown, Texas
Difference in 92 and 94 LT1
I just bought a 1992 LT1 with 7,000 original miles to replace my 94 engine. Other than the camshaft, what are the differences in the two engines? I am aware the Crank, Rods, Pistons, Block, and Bore and Stroke are the same and I know the cams are different. Are the heads identical? The reason I ask is because of the torque difference of 340@ 3,600 (94) and 330@ 4,000 (92). I'm thinking the difference is the cam, am I correct? Both are Corvette 4 bolt main engines.
Last edited by 94c4er; Nov 2, 2012 at 04:15 AM. Reason: left out they were both Corvette engines.
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I don't recall a camshaft difference but '94MY is SFI I believe. Cylinder heads and intake I believe to be different. Both use the same opti-spark. I believe the fuel lines are different. I have no "first-hand". Never owned one. I would think the swap of the intake is maybe all that's required for your install '92MY to the SFI '94MY car and ECM.
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I just bought a 1992 LT1 with 7,000 original miles to replace my 94 engine. Other than the camshaft, what are the differences in the two engines? I am aware the Crank, Rods, Pistons, Block, and Bore and Stroke are the same and I know the cams are different. Are the heads identical? The reason I ask is because of the torque difference of 340@ 3,600 (94) and 330@ 4,000 (92). I'm thinking the difference is the cam, am I correct? Both are Corvette 4 bolt main engines.
Finding a 19?? anything with 7K miles is a deal !
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From: Baytown, Texas
Original 1994 motor (85,000 Miles) still in the car and runs great except for piston slap when cold. Quietens up at 185 degrees but I do not trust an engine with a knock of any kind. When I bought the car last year I thought it was a rod knock so I purchased a new crank had the rods and pistons checked out and put it back together only to hear the same knock. I have been told by several mechanics, that the knock is piston slap (common to LT-1 and LS motors). I was planning to rebuild it but finding a 7,000 mile engine that is as clean as this, made me think about changing it out instead. I really like having the original engine in the car but for now, it would be easier to put my heads, intake and sensors on the 92 block and drop it in. I even thought about putting a stock 94 cam in it. If the heads were the same, I would keep them on but I can't seem to find information on that. At this point I am confused as to what to do, drop in a vertually new 92 engine or rebuild the 94??? I don't want a hot rod, but I don;t want to go backward on performance either. The stock 94 has plenty of go for me!!
Pro
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From: Richmond VA
DataMaster to log and read codes and Tunercat to flash the computer. All OBD1 software works fine just need the correct cable.
http://www.ttspowersystems.com/ALDL_cable.html
http://www.ttspowersystems.com/ALDL_cable.html
Melting Slicks
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To read codes you run a jumper wire from pins 4 & 12 or a "paperclip"
Codes will display on your dash just like a scan tool
Tuner cat has a USB y cable with OBD 1 & 2 connectors for using with data master & CATS
Codes will display on your dash just like a scan tool
Tuner cat has a USB y cable with OBD 1 & 2 connectors for using with data master & CATS
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From: Annapolis MD
I drew my conclusion from page 114 of the Collectors Originality Guide, CorvetteC4 by Tom Falconer.
It says that a scanner is required "to access it's second generation on-board diagnostics (OBD-2), or the paper clip method used on OBD-1."
The way I read that, the 94 was the first year for OBD-2.
Curious why the factory included that connector if true OBD-2 didn't appear until two years later in the 96.
Just looked quickly at the 1996 specs in the book and didn't see it mentioned.
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I really wanted to know what the differences in the cam and heads were. I did seem to find out differences such as the 92 has different rods (material wise) but all in all I "THINK" the block is the same.
I am also thinking putting my 94 intake and the 94 sensors on the 92 engine should allow a swap without any computer changes, but I don't know that for sure. However I do have a Tuner Cats program in case.
I am also thinking putting my 94 intake and the 94 sensors on the 92 engine should allow a swap without any computer changes, but I don't know that for sure. However I do have a Tuner Cats program in case.
Melting Slicks
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What do you plan on gaining swapping a 94 intake on a 92 block.. besides the front fuel crossover channel molded in the intake. they are the same.. swapping cams & springs.. may help a tiny bit. The 94 Injectors might be in better condition?
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