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What makes a gen IV engine not a gen III?

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Old Dec 20, 2007 | 06:38 PM
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Default What makes a gen IV engine not a gen III?

I just noticed this forum. What makes a LS2 not in the same generation as an LS1? Who tagged this?
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Old Dec 20, 2007 | 07:30 PM
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knock sensor, cam sensor, dod, just to get started.
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Old Dec 22, 2007 | 05:28 PM
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It's something that I'll never agreed with. Different, sure. Need for a new forum, sure. Different generation, hell no. Just cause they moved some stuff around? Generation changes shouldn't be able to interchange parts like LT1 to LS1. I don't really get the gen 1 to gen 2 either.

Last edited by JonCR96Z; Dec 22, 2007 at 06:49 PM.
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Old Dec 22, 2007 | 05:45 PM
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Originally Posted by JonCR96Z
It's something that I'll never agreed with. Different, sure. Need for a new forum , sure different generation, hell no. Just cause they moved some stuff around? Generation changes shouldn't be able to interchange parts like LT1 to LS1. I don't really get the gen 1 to gen 2 either.
No interchange between LT1 and LS1's....LT1's are Gen II ..all engines 1993 back to 1955 are GEN I ...
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Old Dec 22, 2007 | 05:59 PM
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I would say the head and intake design, not? Traver
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Old Dec 22, 2007 | 06:40 PM
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Originally Posted by NHRAMAN
No interchange between LT1 and LS1's....LT1's are Gen II ..all engines 1993 back to 1955 are GEN I ...
No ****. What is your point? Maybe you should read posts before you reply to them. I said that the LT1 to LS1 generation difference I understand, because they are completely different. But SBC to LT1, only has reverse cooling to really set them apart, all other changes can be undone by swapping a few parts. I don't really see how its a different generation. Catch my drift. Same as 3 to 4. Obviously, LS7, LS3 are getting to be that much more different from the LS1, but the LS2 just doesn't do it for me.

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Old Dec 23, 2007 | 05:44 PM
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1st gen engines are from 55-85 right? How many diffrent variations were there? A TON.
1986 they changed the valve cover bolt pattern. Or does gen II not start till the LT1? Gen III is obvious because its a whole new game. But Gen IV ????????
If I recall somewhere in the late 60s or near there they took the front and rear breathers out of the blocks, they used to be casted in the back. Did that constitute for a generation change? No. As far as reality is concerned, there is no Gen IV just a Gen III with some altercations.
And where does the LT5 stand? It was a sbc based engine used in GM production cars.
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Old Dec 23, 2007 | 10:24 PM
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yeah made by lotus
LT5 isn't even a GM motor. maybe similar design but way ahead of its time.
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Old Dec 23, 2007 | 11:23 PM
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Originally Posted by 98slowt/a
yeah made by lotus
LT5 isn't even a GM motor. maybe similar design but way ahead of its time.
The LT5 was made by Mercury marine.

Andrew
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Old Dec 24, 2007 | 01:42 AM
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okay my bad
LT5 was designed and developed by Group Lotus. Chevrolet-Pontiac-GM Canada (CPC) Engineering but built by mercury marine(mercruiser) in stillwater OK.
i was particially right lol.
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Old Dec 25, 2007 | 01:03 PM
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and it wasnt that far ahead of its time. Cadillac has been doing it for quite sometime, and theres is more advanced IMO.
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Old Dec 25, 2007 | 11:37 PM
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yeah but being able to have the valet key and seconday fuel rails with dual fuel pumps.
i think it was ahead of its time. i think that the ZR1 has alot of potential but GM kept it pretty mild. Was cadillac doing it in 1989. I love ZR1's i have always wanted to buy one. just looking for a low mileage one for the right price. changing the cams would cost an arm and a leg lol.
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Old Dec 27, 2007 | 09:56 PM
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^ I love the caddy heads. They are not really all that bulky. Just imagine a 420ish CI DOHC Vette. Probably cost an arm and a leg, but it would be nasty. The ZR1 was amazing. 385HP when the 'fast' cars laid out stuff in the 200s. People have optimized the things and gotten sick power even by todays standards. On that level of tech without FI. With the modern flow analysis and CAD and CNC tech they could make a NA 650HP Vette with a powerband a mile wide. Nevermind what FI would do.

Then again, simplicity, familiarity, economy, and results are pretty nice reasons to stay OHV.

Sorry for the hijack guys.....


IMO the C6 was more like a C53/4 anyway in the beginning. The new hardware does blow away the C5 stuff though. Fine by me, I'll be able to get a clean low mileage C5 soon when the prices go down
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