Which LT4 do I Have?
Safety Car
Joined: Apr 2002
Posts: 3,531
Likes: 1
From: Conroe TEXAS!
Cruise-In X Veteran
They didnt make a Tahoe with an LT4..
Edit: if it was swapped in...true Lt4's were only made in 96. Could be an LT1 with an LT4 top end. (basically the same thing)
Oh and I want pic's.....thinking of swapping an LTX into my pickup
Edit: if it was swapped in...true Lt4's were only made in 96. Could be an LT1 with an LT4 top end. (basically the same thing)
Oh and I want pic's.....thinking of swapping an LTX into my pickup
Last edited by Firevette; Dec 4, 2007 at 09:23 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Trucks used a "vortec" V8, its not an LT1 or Lt4. Blocks are good though. In (pretty sure) 2000 they went to the LS based motor and also called it a "Vortec". The pre LS ones were reliable but dont expect any power out of them.
Thread Starter
Instructor
Joined: Oct 2006
Posts: 117
Likes: 0
From: Beverly Hills Florida
Lt4
I have documentation on the conversion. It was a special build of a 92 Blazer with a LT4 and a Vortech supercharger, coupled to a 4L60E trans.
Was told there are differences like opti spark vent tube, etc. Thought there might be block casting number or some indetifiable way . Is there also a way of having the PCM based lined so I know what I have?
Thanks Again!
Was told there are differences like opti spark vent tube, etc. Thought there might be block casting number or some indetifiable way . Is there also a way of having the PCM based lined so I know what I have?
Thanks Again!
Burning Brakes
Joined: Jan 2001
Posts: 1,135
Likes: 23
From: Joplin, MO, USA
According to the Black Book, early heads were #10239902, later ones were #12555690. Blocks were the same, LT4 was basically a head & compression ratio change, cam, and roller rockers, 6300 rpm redline.
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Burning Brakes
Joined: Nov 2006
Posts: 843
Likes: 0
From: Albany Oregon
I have documentation on the conversion. It was a special build of a 92 Blazer with a LT4 and a Vortech supercharger, coupled to a 4L60E trans.
Was told there are differences like opti spark vent tube, etc. Thought there might be block casting number or some indetifiable way . Is there also a way of having the PCM based lined so I know what I have?
Thanks Again!
Was told there are differences like opti spark vent tube, etc. Thought there might be block casting number or some indetifiable way . Is there also a way of having the PCM based lined so I know what I have?
Thanks Again!
I have a 'Vette '92 with an LT-1...Lt-4 didn't exist then.
I have owned a '95 Blazer that had a 4.2 v6 in it..
How did you come to own a '92 Blazer with an LT-4????
Custom install?????????????????????????????????
Next question...WHY???
Thread Starter
Instructor
Joined: Oct 2006
Posts: 117
Likes: 0
From: Beverly Hills Florida
Why Not?
I didnt build it, I just found it and bought it. I can look in the oil fill opening and see the roller rockers. Just going to restore it back to like new. This was a feature truck in Sport Truck mag back in 1995. Just want to make sure, if needed the right year opti-spark, etc. Want to know if
Ii can some how baseline the PCM so I know what I have.
Will post some pics as soon as I take some.
Ii can some how baseline the PCM so I know what I have.
Will post some pics as soon as I take some.
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
I didnt build it, I just found it and bought it. I can look in the oil fill opening and see the roller rockers. Just going to restore it back to like new. This was a feature truck in Sport Truck mag back in 1995. Just want to make sure, if needed the right year opti-spark, etc. Want to know if
Ii can some how baseline the PCM so I know what I have.
Will post some pics as soon as I take some.
Ii can some how baseline the PCM so I know what I have.
Will post some pics as soon as I take some.
Racer
Joined: Sep 2007
Posts: 284
Likes: 0
From: Cerritos/L.A. California
could be a real LT-4 depending on when it was swapped, however highly doubtful. The vehicle originally came with a 4.3 V-6. Basically a 350 with 2 less cylinders. The vortec designation started in V-8s in 96, V-6s in 92. It was the tpi injection that gave it the vortec name
Last edited by tcr75; Dec 5, 2007 at 02:25 AM.
Race Director
Joined: Oct 2005
Posts: 11,771
Likes: 177
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
could be a real LT-4 depending on when it was swapped, however highly doubtful. The vehicle originally came with a 4.3 V-6. Basically a 350 with 2 less cylinders. The vortec designation started in V-8s in 96, V-6s in 92. It was the tpi injection that gave it the vortec name
The Tahoe (Full size) was available with the 5.7 Vortec V8
I agree with some of the others. This was not a factory conversion.
On this year's Hot Rod Power Tour, there was a Blazer (S-10) with an LT4 in it. The guy was from Oklahoma, and had a pretty cool sounding truck. So, I went over to take a look and found the LT4 sitting under the hood. A custom shop had done the conversion.
Le Mans Master
Joined: Dec 2003
Posts: 5,768
Likes: 33
From: Van Steel Corvettes
St. Jude Donor '12-'13
I've seen a few LT-1/4 truck conversions. Even thinking about it for my 89 chevy, but I'll probably go with a 383 stroker L98! Wether or not you have an LT-1 or LT-4, it's a great motor! Most of your parts, minus the head and intake, should be the same.
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
If it was built pivately and featured in a mag in 1995 then it is not an original LT4 engine, GM didn't release them into production until 1996. It could very well be an LT1 conversion originally, which was then later swapped over to the LT4 heads and intake. Either way, sounds like a fun ride!
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
True, but for this car to have been featured in a magazine in 1995 would have forced someone to buy an LT4 corvette, then rip the engine out and put in the truck...unless it was a totalled car I don't see that happening. And even if it was a totalled car, I doubt anyone would have been able to do it in the time frame.
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
True, but for this car to have been featured in a magazine in 1995 would have forced someone to buy an LT4 corvette, then rip the engine out and put in the truck...unless it was a totalled car I don't see that happening. And even if it was a totalled car, I doubt anyone would have been able to do it in the time frame.
But you don't think GM had crate/replacement motors for sale at the same time or shortly after the 'vette was for sale?
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
How long after the Z06 was released was the LS7 available? About 8-10 months if I remember right. I'm pretty sure the LT4 was the same way