Difference between 95 and 97 LT1 motor???
Thread Starter
Registered User
Joined: Apr 2002
Posts: 241
From: Back in Bancroft MI.
Difference between 95 and 97 LT1 motor???
What are the differences of these two different years of lt1....i have a 95 camaro and i just put a 97 motor in it well the only thing i thought different was the computer and the timing cover.....So i put my 95 style opti on the 97 timing cover.....and motor.....car is running like crap missing and backfireing it seems to be getting worse as it runs or is drivin.....am i tearing up my 95 style opti for some reason...it has new plugs and wires.....also,,,any help would be appreciated
Registered User
Joined: Jan 2002
Posts: 275
From: Goose Creek, SC
Re: Difference between 95 and 97 LT1 motor???
Well in a nut shell, the exhaust (96+ have dual cats) The optispark is Non-vented and the timing cover is different design, as well as the fact that the 96+ have a crank sensor) and the 97s have the newer redesigned dash in them...thats all i can think of off the top of my head...
Registered User
Joined: Aug 2003
Posts: 915
From: Tucson, AZ
Re: Difference between 95 and 97 LT1 motor???
95 was still OBD-I, 97s were OBD-II. Not an acutal engine difference, but if you are running the 97 computer as well and don't have the post-cat O2 sensor that is gunna make the car run in open loop i think (i know removing pre-cat O2s will force open loop operation, not sure about post-cat on an OBD-II seutp).
The 95/97 opti setup is the same, so is the dowel pin on the cam.
The 95/97 opti setup is the same, so is the dowel pin on the cam.
Registered User
Joined: Jan 2002
Posts: 275
From: Goose Creek, SC
Re: Difference between 95 and 97 LT1 motor???
Originally Posted by Pasky
95 Was vented, please go back to school...
Oh Christ, I've been working on hummers for USAF for the past year and sold my Z a year ago so i got one thing wrong, u seem like the kind of **** idiot savant that happens to be an opti-know it all...kids....
Registered User
Joined: Jan 2002
Posts: 275
From: Goose Creek, SC
Re: Difference between 95 and 97 LT1 motor???
Oh well thats cool, i get all riled up very easly, so i apologize on my behalf...still no matter what year is bought 95 or 97 they all hold ALOT of potential!!! 
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
Re: Difference between 95 and 97 LT1 motor???
Originally Posted by indieaz
95 was still OBD-I, 97s were OBD-II. Not an acutal engine difference, but if you are running the 97 computer as well and don't have the post-cat O2 sensor that is gunna make the car run in open loop i think (i know removing pre-cat O2s will force open loop operation, not sure about post-cat on an OBD-II seutp).
The 95/97 opti setup is the same, so is the dowel pin on the cam.
The 95/97 opti setup is the same, so is the dowel pin on the cam.
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
Re: Difference between 95 and 97 LT1 motor???
Originally Posted by Lt1t56
The 95 is OBD1 with a 16 pin diagnostic connector ( OBD 2 ) opposite of what jdizzell posted. Not sure on California cars.
