lt-1 1992 vs 1995
Melting Slicks
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
Excluding the injection system, the only real difference on the block itself would be the front timing cover using a pin drive opti rather than a spline drive. Additionally, a 96' block would have a provision for a CPS on the front cover.
Le Mans Master
Joined: May 2005
Posts: 7,359
Likes: 2,281
From: Central Maryland
I can't offer a comprehensive list of differences, but can say the following:
1. 1992 injectors are batch-fired. 1994-1996 are sequential.
2. 1992 PCM uses EPROMs for memory. 1994-1996 PCM uses flash memory.
Given the above, it's probably best to plan on migrating the 1995 PCM along with the engine, if that's an option.
3. 1992 uses a passively-vented Optispark distributor (has weep holes in the bottom of the housing). 1995 uses an actively-vented distributor (draws filtered air through the distributor, and from there into the intake). So either migrate the 1995 intake bellows if that's an option, or plan to drill a small hole in the 1992 bellows for the distributor vent hose fitting.
As noted by TorchTarga above, the camshafts, distributors, and timing chain covers are different, although this shouldn't interfere with an engine swap.
Live well,
SJW
1. 1992 injectors are batch-fired. 1994-1996 are sequential.
2. 1992 PCM uses EPROMs for memory. 1994-1996 PCM uses flash memory.
Given the above, it's probably best to plan on migrating the 1995 PCM along with the engine, if that's an option.
3. 1992 uses a passively-vented Optispark distributor (has weep holes in the bottom of the housing). 1995 uses an actively-vented distributor (draws filtered air through the distributor, and from there into the intake). So either migrate the 1995 intake bellows if that's an option, or plan to drill a small hole in the 1992 bellows for the distributor vent hose fitting.
As noted by TorchTarga above, the camshafts, distributors, and timing chain covers are different, although this shouldn't interfere with an engine swap.
Live well,
SJW
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
Also,
You will need to get a vent harness for the opti (or make one). You will also need the change the electrical harness for the opti. The later style vented optis had a different electrical connector.
Also, what is the LT1 coming out of? If it is a caprice/impala it may have iron heads.
You will need to get a vent harness for the opti (or make one). You will also need the change the electrical harness for the opti. The later style vented optis had a different electrical connector.
Also, what is the LT1 coming out of? If it is a caprice/impala it may have iron heads.
Last edited by VeTTeMaNC486; Jul 6, 2016 at 07:29 PM.
Melting Slicks
Joined: Jul 2002
Posts: 2,223
Likes: 556
From: Tallahassee fl
besides going from batch to sequential the injectors are a different size too. 22lbs I think for 92 and 24lbs for 95.
It's probably easier headache wise to swap over the parts that are different from the old engine just to make it easier
It's probably easier headache wise to swap over the parts that are different from the old engine just to make it easier
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Computers dont care which GEN II they control and both early and late model opti's use the same siganl. So for a swap u only need a opti cable and use the correct opti vent for the model installed.
FWIW i'm running a late model opti motor ('95-'96) in my early ('94) opti camaro. Only those 2 items needed to change - opti cable and opti vent.
Hope this helps.
FWIW i'm running a late model opti motor ('95-'96) in my early ('94) opti camaro. Only those 2 items needed to change - opti cable and opti vent.
Hope this helps.
Le Mans Master
Joined: May 2005
Posts: 7,359
Likes: 2,281
From: Central Maryland
Computers dont care which GEN II they control and both early and late model opti's use the same siganl. So for a swap u only need a opti cable and use the correct opti vent for the model installed.
FWIW i'm running a late model opti motor ('95-'96) in my early ('94) opti camaro. Only those 2 items needed to change - opti cable and opti vent.
Hope this helps.
FWIW i'm running a late model opti motor ('95-'96) in my early ('94) opti camaro. Only those 2 items needed to change - opti cable and opti vent.
Hope this helps.
Live well,
SJW
