LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How do I know what Generation my Z is?

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Old 07-15-2009, 08:06 AM
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How do I know what Generation my Z is?

I keep seeing 3rd and 4th gerneration of LT1. All I know is I have the 1994 Camaro Z28 that was sold w/ the governer chip and reads 115 on the speedometer. I believe that the generation only deals w/ the engine so I posed this question. Also off topic can someone tell me wht other models are compatable w/ interion panels (door) for a 94 z28.

Much thanks..
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Old 07-15-2009, 08:17 AM
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You have a 4th generation Camaro. I have never seen the LT engine model referred to in the manner you mentioned. It is considered a Generation II engine from GM. All LT blocks, essentially were the same (no flame on the corvette 4 bolt mains, ok guys).

There was mutliple computers that ran the LT1. Your 94 uses an OBD I PCM and does not use a "chip". The PCM can be reprogrammed directly in the car. With software, that govenor can be taken out very easily. That is the way they came from the factory.

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Old 07-15-2009, 08:21 AM
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Thanks for clearing up the confusion...I need to order parts and I didn't get the generation thing - if it was model related or engine. That clears it up.
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Old 07-15-2009, 11:49 AM
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67-69 = 1st generation
70-81 = 2nd generation
82-92 = 3rd generation
93-2002 = 4th generation (i split it up, 93-97 is 4th, 98-02 is 4.5 generation)
2010 is start of the 5th generation
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Old 07-15-2009, 12:51 PM
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Originally Posted by reamo04
67-69 = 1st generation
70-81 = 2nd generation
82-92 = 3rd generation
93-2002 = 4th generation (i split it up, 93-97 is 4th, 98-02 is 4.5 generation)
2010 is start of the 5th generation
Its not split up. How many engines & variations were in the 1st, 2nd & 3rd gens? Who refers to things in half generations seriously?
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Old 07-15-2009, 02:12 PM
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I think the confusion comes from the fact that we also count generations of the small block V8. The Gen1 V8 came out in 1953 in an Oldsmobile and lasted until 1992.

The LT1 came out in 1992 (in the Corvette) and was the first Gen2 V8. The LT4 was another Gen2. The LT5 is an anomaly that has nothing in common with any GM engine.

The LS1 came out in 1997 (again in the Corvette) and was the first Gen3 V8. LS6 (from the C5 Z06 and original CTS-V) was also Gen3.

The LS2 came out in 2005 (GTO, CTS-V, and C6 Corvette) and was the first Gen4 V8. The LS7, LS3, LS9, and LSA are all members of this generation.

A rumored fifth generation V8 is supposedly in development (although possibly on hold while GM works out the bankruptcy and restructuring stuff).
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Old 07-15-2009, 02:29 PM
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Model generations are normally based on body style (minor changes don't count).

Engine generations are totally another thing.


Originally Posted by METALBEAST
Its not split up. How many engines & variations were in the 1st, 2nd & 3rd gens? Who refers to things in half generations seriously?
Truly. It's either a generation or it's not.
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Old 07-15-2009, 05:37 PM
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The 1953 Oldsmobile V8 engine was not a Gen 1 SBC (Small Block Chevy). The Gen 1 SBC originated with the 1955 Chevy (aka "Shoebox" ). It was used right up into the late 1990's in the GM trucks.
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Old 07-15-2009, 06:20 PM
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Originally Posted by JakeRobb
The LT5 is an anomaly that has nothing in common with any GM engine.

The LS1 came out in 1997 (again in the Corvette) and was the first Gen3 V8. LS6 (from the C5 Z06 and original CTS-V) was also Gen3.

The LS2 came out in 2005 (GTO, CTS-V, and C6 Corvette) and was the first Gen4 V8. The LS7, LS3, LS9, and LSA are all members of this generation
First I laughed at the LT5 anomaly, it is totally true, built by mercury marine and designed with Lotus, and all funded by GM.....[EDITED]

And why they divide up the LS motors is insane. They are both designed on the same basic structure. If I'm not mistaken isn't it only a top end difference? If I'm right, why classify them as two separate generations of engines? I understand the classic SBC to LT, but they didn't do a Gen change when they started using centerbolt v/c's and one-piece rear main seals. The block is essentially unchanged, then why would we do it for an engine that has only had new heads and intake put onto it......

Just a senseless rant I suppose....

Last edited by Injuneer; 07-15-2009 at 10:12 PM. Reason: Do not over ride the language filter.
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Old 07-15-2009, 10:09 PM
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Originally Posted by crash4cyl
And why they divide up the LS motors is insane. They are both designed on the same basic structure. If I'm not mistaken isn't it only a top end difference?
Not exactly. The Gen4 motors have support for AFM, which involves special oiling provisions to the lifters.
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Old 07-16-2009, 09:16 AM
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Originally Posted by JakeRobb
Not exactly. The Gen4 motors have support for AFM, which involves special oiling provisions to the lifters.
Plus there were some "block breathing" issues with the LS1 that forced a redesign.
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Old 07-16-2009, 09:19 AM
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Originally Posted by METALBEAST
Its not split up. How many engines & variations were in the 1st, 2nd & 3rd gens? Who refers to things in half generations seriously?
Well I do for one! Only I refer to them as 4th Gen. A & 4th Gen. B cars. Because not only did they change the front, they had different engines too.
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Old 07-16-2009, 10:36 AM
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Originally Posted by Z28SORR
Well I do for one! Only I refer to them as 4th Gen. A & 4th Gen. B cars. Because not only did they change the front, they had different engines too.
1st gens has a ton of different engines and front end changes. Were they A, B, C? No.
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Old 07-17-2009, 07:14 AM
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Originally Posted by Z28SORR
Well I do for one! Only I refer to them as 4th Gen. A & 4th Gen. B cars. Because not only did they change the front, they had different engines too.
OK
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Old 07-17-2009, 10:41 AM
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Originally Posted by shoebox
1st gens has a ton of different engines and front end changes. Were they A, B, C? No.
That was then, this is now. Stop living in the past.
Actually there were so many changes in '69 it probably should have been called a 2nd Gen.
Besides you and I both know that the engine/trans. has nothing to do with the term, "Generation," as applied to Corvettes and Camaros.
I wasn't being serious!!!
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