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

95'lt1 going into a 97' M6 ?

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Old Jun 4, 2018 | 11:02 PM
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Default 95'lt1 going into a 97' M6 ?

i got a 95 lt1 out of a TA and was wondering if the 97' computer and harness will work with the motor? i got a 1997 TA and wanna put my 95' 383 into it..
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Old Jun 5, 2018 | 01:11 PM
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I believe it should be a pretty straight forward swap.

Some differences that may need to be addressed is the crank sensor and the knock sensor.

I think you'll need to swap over the timing cover, crank sensor, and crank reluctor wheel, as well as the knock sensor over to the '95 engine.
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Old Jun 5, 2018 | 01:35 PM
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^^^^ and also use the damper hub from the 97 motor.

The 95 block will have a NPT plug you remove on one side of the motor so you can install the 2 knock sensors from the 97 (one on each side of the block)
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Old Jun 5, 2018 | 01:44 PM
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OBDII f-bodys don't have two knock sensors. Are the opti harnesses the same, or is a vented opti going in?
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Old Jun 5, 2018 | 03:15 PM
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Originally Posted by ******
^^^^ and also use the damper hub from the 97 motor.

The 95 block will have a NPT plug you remove on one side of the motor so you can install the 2 knock sensors from the 97 (one on each side of the block)
i was told that the only thing I'd need to change is the the one knock sensor on the block from a 95 to a 97 sensor and that changing out the hub to a 97 was optional. I'm really not wanting to change that damn hub out again it's kind of a pita
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Old Jun 5, 2018 | 03:16 PM
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Originally Posted by SS RRR
OBDII f-bodys don't have two knock sensors. Are the opti harnesses the same, or is a vented opti going in?

arent 93-94 Opti's and 95-97 opti's all the same ? That's what I thought atleast .
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Old Jun 5, 2018 | 03:18 PM
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And I am gonna be using the 97 harness and computer correct ? That's also what I was told . Nothing 95 related for electronics..
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Old Jun 5, 2018 | 03:40 PM
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Originally Posted by ******
^^^^ and also use the damper hub from the 97 motor.

The 95 block will have a NPT plug you remove on one side of the motor so you can install the 2 knock sensors from the 97 (one on each side of the block)
also what would happen if I just switched over one knock sensor instead of two? Is two needed ?
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Old Jun 5, 2018 | 03:42 PM
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IIRC, if the 95 is vented then you should be good if using an OBDII harness/PCM.
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Old Jun 5, 2018 | 06:18 PM
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Originally Posted by Joe Soucy


i was told that the only thing I'd need to change is the the one knock sensor on the block from a 95 to a 97 sensor and that changing out the hub to a 97 was optional. I'm really not wanting to change that damn hub out again it's kind of a pita
The hub on the 97 (OBD2 car) is shorter because you have a reluctor ring for the CPS. If you want your belt to line up you need to maintain your 97 hub on the 95 motor since you will use the 97 TC and reluctor wheel

Didn't know F body OBD2 LT1's only used one KS so if that's the case just use your 97 sensor in the 95 motor. Look up the TQ to tighten it. Don't over TQ it

Yes use your 97 PCM and harness
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Old Jun 5, 2018 | 06:25 PM
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Originally Posted by ******
The hub on the 97 (OBD2 car) is shorter because you have a reluctor ring for the CPS. If you want your belt to line up you need to maintain your 97 hub on the 95 motor since you will use the 97 TC and reluctor wheel

Didn't know F body OBD2 LT1's only used one KS so if that's the case just use your 97 sensor in the 95 motor. Look up the TQ to tighten it. Don't over TQ it

Yes use your 97 PCM and harness
is there any possible way I can run the 95 timing cover ? Because I just got done assembling my 383 lol and didn't know . Anyway I could delete some stuff to make it easier ?
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Old Jun 5, 2018 | 06:29 PM
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Originally Posted by ******
The hub on the 97 (OBD2 car) is shorter because you have a reluctor ring for the CPS. If you want your belt to line up you need to maintain your 97 hub on the 95 motor since you will use the 97 TC and reluctor wheel

Didn't know F body OBD2 LT1's only used one KS so if that's the case just use your 97 sensor in the 95 motor. Look up the TQ to tighten it. Don't over TQ it

Yes use your 97 PCM and harness
tbh I think I should probably just switch it over to the 97 parts just so I won't have any problems.. it's just a pain to take it apart again lol
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Old Jun 5, 2018 | 06:45 PM
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Originally Posted by Joe Soucy


is there any possible way I can run the 95 timing cover ? Because I just got done assembling my 383 lol and didn't know . Anyway I could delete some stuff to make it easier ?
IDK if the CPS can be "tuned out" on a OBD 2 PCM. Ask your tuner

if you converted to OBD1 you can use the 95 cover. IDK what is involved in converting a OBD2 car to OBD1 but people have done it.

If plug in emissions is a issue for you, can't convert a OBD2 car to OBD 1 and pass emissions plug in test

if motor is buttoned up with 95 TC and hub...you will need to drop front of oil pan enough to remove TC

R&R the hub is not hard. A standard star puller gets them off and you can make a install tool simple with all thread rod, large fender washers, thrust bearing and 1 nut the size of all thread (same size as crank bolt thread)
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Old Jun 6, 2018 | 07:35 AM
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Originally Posted by Joe Soucy


is there any possible way I can run the 95 timing cover ? Because I just got done assembling my 383 lol and didn't know . Anyway I could delete some stuff to make it easier ?
yes. cps can be tuned out.
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Old Jun 6, 2018 | 10:10 AM
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Originally Posted by SS RRR

yes. cps can be tuned out.
if that is tuned out then i can run both my 95 TC and 95 crank hub then ?
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Old Jun 6, 2018 | 10:58 AM
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Yep just as long as you do not have a crank reluctor wheel in place.
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Old Jun 6, 2018 | 11:08 AM
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Originally Posted by SS RRR
Yep just as long as you do not have a crank reluctor wheel in place.
and 95 f body lt1s didn't come with a crank reluctor wheel correct ? So I should be good .
also would it run fine if its tuned out?

Last edited by Joe Soucy; Jun 6, 2018 at 11:27 AM. Reason: veryyyyy bad spelling error xD
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Old Jun 6, 2018 | 12:15 PM
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Originally Posted by Joe Soucy


and 95 f body lt1s didn't come with a crank reluctor wheel correct ? So I should be good .
also would it run fine if its tuned out?
yes and yes...assuming your tuner tunes out the CPS.
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