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Old 06-07-2017, 07:42 PM   #1
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1991 35' Airstream 350
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Vortec 7400, the last of the 454's

Came across a magazine article that covered "junkyard" finds for engine rebuilders. To quote from this article, "The GM Vortec 7400 was the last iteration of the old 454 and can be found in 3/4 ton Suburbans. Apparently, this engine had factory roller lifters and 4 bolt main caps. Anyone done a transplant or know of the relevant years for us "junkyard dogs"
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Old 06-07-2017, 07:52 PM   #2
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Vortec 7400

Wish I'd heard of this before rebuilding my 454..looks to be a far superior engine and one that is readily available? Seems 1996 was the vintage year?
A rebuilt 7400 goes for around $2000..about the price for for a earlier 454 rebuild

https://archives.media.gm.com/divisi...up/ckpeng3.htm
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Old 06-08-2017, 03:21 PM   #3
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Interesting article Chris. I never knew about that engine variant and looks good. We do get some Suburbans which are parted out over here, so maybe an option for me if we ever need to replace or rebuild the 454 L19. If we did got for the 7400, do you know what else you would need to change to get a fully functional rig?

all best
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Old 06-09-2017, 07:37 AM   #4
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Good Question!

Nick...good question as I could not find any other info than what I posted on the link following my original posting. would guess that the bell housing would be the same and would accept either a 4L80e, 700r4 or the existing TH400 transmission. If I was ever to consider the Vortec, I would certainly add the overdrive capability.Not sure about the other performance issues which were noted in the link. I was rather hoping that another Forum Member would be able to add commentary!
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Old 06-09-2017, 01:25 PM   #5
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Quote:
Originally Posted by chriscraw View Post
Came across a magazine article that covered "junkyard" finds for engine rebuilders. To quote from this article, "The GM Vortec 7400 was the last iteration of the old 454 and can be found in 3/4 ton Suburbans. Apparently, this engine had factory roller lifters and 4 bolt main caps. Anyone done a transplant or know of the relevant years for us "junkyard dogs"
Hey all, thought I'd join in on the 454 chat as I owned a 2005 Chevy Suburban 2500 4x4 LT as my long time TV - 200k miles worth. By this point the 454 became the 8.1L punched out to a stock 496 ci. Terrible mileage (10.8 empty or hauling) but a smooth running beast that would haul a house all day long. I believe the last year GM produced the engine was 2006.
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Old 06-09-2017, 04:01 PM   #6
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I had a 1998 Chevy 1-ton van with a 454. That may be harder to find than a 3/4 ton suburban.

The engine was strong but thirsty. It would get 9 around town and 9 towing my 25 ft classic on the highway. It would do better on the highway solo, but I seldom used it for that.
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Old 08-02-2017, 07:20 AM   #7
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Was the Vortec 454 fuel injected? If so, a transplant would need to include the wiring harness and computer.
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Old 08-02-2017, 09:58 AM   #8
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Yes, fuel injected and also moved to OBD2 diagnostics
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Old 08-02-2017, 02:55 PM   #9
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A viable alternative BUT not a straight swap for you 454 guys as these engines would be pared with the 4L80e, so TPS, coil over plug, so PCM for fuel injection and other electronics needed.

The 8.1/Allison swap that was written up in another thread would be a far better powertrain to spend your efforts on, IMHO. If you're going to spend the bucks, go big.

Cheers
Tony
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Old 08-03-2017, 08:48 AM   #10
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Tony 91 -93 classics came with the 4l80e.
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Old 08-03-2017, 09:07 AM   #11
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Originally Posted by Isuzusweet View Post
A viable alternative BUT not a straight swap for you 454 guys as these engines would be pared with the 4L80e, so TPS, coil over plug, so PCM for fuel injection and other electronics needed.

The 8.1/Allison swap that was written up in another thread would be a far better powertrain to spend your efforts on, IMHO. If you're going to spend the bucks, go big.

Cheers
Tony
Ive got a 1999 k2500 suburban with the 7400 with 193K miles. its not coil on plug, TPS is on the Throttle body already. If you pulled the tranny too it would have all the speed sensors required. And the ecm can be reprogrammed to omit certain things (ABS etc) , The ECM is not a big deal to pull out either. The 4L80e probably wouldn't stand up to the Motor home weight in its stock light truck config (unless you never pulled in OD) but it could be beefed up like the above post suggests. On the plus side the tranny mount and the engine mounts should line up pretty closely albeit that your drive shaft would have to be shortened for the OD tailhousing. I have no experience with Allison to say how that would play out.

I did an cummins swap in a jeep wagoner a few years ago and it was all the little things that got deep. Hooking up the factory 4wd lever and Air-conditioning were the worst as I recall. But I say go for it.

I'm guessing but I'm thinking it was 1996-1999 for the vortech 7400
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Old 08-06-2017, 04:00 AM   #12
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My limited understanding still suggests a 7400 is a near straight swap for classics 91-93 with 4L80e. I suppose that is an advantage for me because you can pick up rebuilt 7400s for a $3k over here,far cheaper than shipping a crate engine for me
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Old 08-06-2017, 10:36 AM   #13
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My limited understanding still suggests a 7400 is a near straight swap for classics 91-93 with 4L80e. I suppose that is an advantage for me because you can pick up rebuilt 7400s for a $3k over here,far cheaper than shipping a crate engine for me


I would think if the tranny stays the same, then that's probably accurate. You might run into some small problems, like the mechanical fuel pump mounting location is absent on the 7400 and if something mounted there it will have to be relocated. Minor things like that.
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