first engine swap- LT1/T56
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
I suppose I owe this thread an update although I really am reaching a point in the build where it is no longer LTX related...
I have decided not to sell the car after much deliberation. Instead, my brother who lives in Norfolk has taken the car to school with him to escape my parents driveway. Since then, I have decided to invest more into the car because I plan to hang on to her for quite some time.
A few weeks ago I bought a new set of tires for the car which as Pocket mentioned earlier was more expensive than it ever should be thanks to the 18s in the rear.
Tomorrow the car comes back from having all of the weatherstripping replaced. Which wasnt cheap either
I also just purchased a pair of Sparco Sienna seats with sliders and brackets. After the Christmas break I will be having them installed with an 8 point roll cage and harnesses.
The overall idea is to move the car more towards a weekend auto x car but maintain its driveability for the street. The antique registration ensures that it will never really be illegal so the sky is the limit.
Next week when I return to Virginia my brother and I are going to rebuild the exhaust since we recently acquired a welder. I ordered a Hawks double hump crossmember to replace my spohn one, so we will be able to run a dual system with an X pipe still turned down before the rear. I will be on here more often with pictures and info as I continue to work on the car.
Cheers,
Steven
I have decided not to sell the car after much deliberation. Instead, my brother who lives in Norfolk has taken the car to school with him to escape my parents driveway. Since then, I have decided to invest more into the car because I plan to hang on to her for quite some time.
A few weeks ago I bought a new set of tires for the car which as Pocket mentioned earlier was more expensive than it ever should be thanks to the 18s in the rear.
Tomorrow the car comes back from having all of the weatherstripping replaced. Which wasnt cheap either

I also just purchased a pair of Sparco Sienna seats with sliders and brackets. After the Christmas break I will be having them installed with an 8 point roll cage and harnesses.
The overall idea is to move the car more towards a weekend auto x car but maintain its driveability for the street. The antique registration ensures that it will never really be illegal so the sky is the limit.
Next week when I return to Virginia my brother and I are going to rebuild the exhaust since we recently acquired a welder. I ordered a Hawks double hump crossmember to replace my spohn one, so we will be able to run a dual system with an X pipe still turned down before the rear. I will be on here more often with pictures and info as I continue to work on the car.
Cheers,
Steven
Last edited by kthxbai; Dec 12, 2011 at 06:18 PM.
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
my brother picked these up today:

Can't wait to get them in.
On that note, I think that I may remove the stock door handles/armrests that stick out super far from the doors and come up with a slimmer alternative to allow for the door braces of the cage to fit more easily, as well as the seats.
I'm hoping they wont take too much modification to fit since they are larger than stock.
Steven

Can't wait to get them in.
On that note, I think that I may remove the stock door handles/armrests that stick out super far from the doors and come up with a slimmer alternative to allow for the door braces of the cage to fit more easily, as well as the seats.
I'm hoping they wont take too much modification to fit since they are larger than stock.
Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
As far as I know everything is running fine. I don't return to Virginia until saturday and I havent seen the car since thanksgiving.
my brother started test fitting the seats this afternoon- they look great.

If I have the time over break I am also going to repaint my T-top edges and a few other small trim pieces.
(only one more final exam and then I can go home)
Steven
my brother started test fitting the seats this afternoon- they look great.

If I have the time over break I am also going to repaint my T-top edges and a few other small trim pieces.
(only one more final exam and then I can go home)
Steven
Re: first engine swap- LT1/T56
Hey guys, I am Steven's brother and figured I'd make an account so I can keep you all posted on the progress rather then Steven having post everything. I am just waiting for my friend to come over w/ his grinder/welder so we can start fitting the passenger seat. If all goes well we will move on to the driver side. The goal for tonight is to just get everything tac'd in place since he just has a crappy fluxcore MIG welder and then I will have access to a good welder tomorrow and finish weld them. Then this little project will be done and I will be sure to post pics of the finished product!
-Will
-Will
Joined: Oct 2007
Posts: 1,375
Likes: 6
From: Wyoming
Car: 1995 Formula
Engine: LT1 350
Transmission: Built 4L60e
Axle/Gears: 10 bolt, Eaton posi, 3.73's
Re: first engine swap- LT1/T56
Heck yeah buddy. I had finals last week. Fun!!
My engine should be done by the end of January or so. Can't wait to post pics of the beast.
Ill have my tranny next month too. It's all rebuilt and ready to go.
I'm getting the Hawks crossmember too and am gonna have a guy here in Casper build me a nice set of custom "tri-y" headers as soon as the engine and tranny are bolted into the car.
Those seats look nice. I just started tearing into my front end yesterday. Good times!!!
My engine should be done by the end of January or so. Can't wait to post pics of the beast.
Ill have my tranny next month too. It's all rebuilt and ready to go.
I'm getting the Hawks crossmember too and am gonna have a guy here in Casper build me a nice set of custom "tri-y" headers as soon as the engine and tranny are bolted into the car.

Those seats look nice. I just started tearing into my front end yesterday. Good times!!!
Re: first engine swap- LT1/T56
Well guys I'm currently at a stand still until I can locate some drill bits. My current set is with a friend and he is no longer in Norfolk for the holidays..I may go try and buy a small set really quick. I really want to finish these today or tomorrow at the latest.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
last night we stayed up late and got to work on the new exhaust. Unfortunately I am waiting until brackets arrive to install the seats 
old pipes (~2 inches of clearance...)

new xmember and heddman extenstions:

right after finish welding the x pipe:

we came within two welds of finishing and ran out of wire in the flux-core... We will have to go out today and wrap this up later.

Merry Christmas!
Steven

old pipes (~2 inches of clearance...)

new xmember and heddman extenstions:

right after finish welding the x pipe:

we came within two welds of finishing and ran out of wire in the flux-core... We will have to go out today and wrap this up later.

Merry Christmas!
Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Unfortunately my welder seems to have shorted somehow. While I was replacing the wire spool the torch sparked and blew the internal fuse. 4 fuses later it still shorts as soon as the power switch is flipped..
Guess I will just have to pick up a new welder after Christmas.
~Steven
Guess I will just have to pick up a new welder after Christmas.
~Steven
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From: Dixon, IL
Car: 91 RS
Engine: LTwon
Transmission: T-56
Axle/Gears: Both
Re: first engine swap- LT1/T56
Good point.
Some people can get by on a cheap one for quite a while. But its always a good investment for a nice one
Some people can get by on a cheap one for quite a while. But its always a good investment for a nice one
Joined: Oct 2007
Posts: 1,375
Likes: 6
From: Wyoming
Car: 1995 Formula
Engine: LT1 350
Transmission: Built 4L60e
Axle/Gears: 10 bolt, Eaton posi, 3.73's
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56

Bought a new welder and zipped everything up today. Got it on the car as well, but having some clearance issues at the turn downs. Planning on ripping it up again tomorrow morning to tweak things around. The X pipe and up past the transmission tucks up quite nicely though. All in all a great foundation to perfect in the coming days.


oh, and it sounds like a monster too

~Steven
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From: Dixon, IL
Car: 91 RS
Engine: LTwon
Transmission: T-56
Axle/Gears: Both
Re: first engine swap- LT1/T56
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
After a few new cuts and angles today the whole system is finally installed and ready to roll. I managed to tuck the mufflers up considerably higher than they were yesterday, and I have exceptional ground clearance the whole way.
I am so happy to finally put all of the worrying about scraping and bottoming out behind me, and to also bolster the muscle car sound provided by the dual powersticks.




Couldn't be any happier for a home-made setup.
~Steven
I am so happy to finally put all of the worrying about scraping and bottoming out behind me, and to also bolster the muscle car sound provided by the dual powersticks.




Couldn't be any happier for a home-made setup.
~Steven
Thread Starter
Member
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
After the cage, seats, and harnesses are installed I may need to give the wallet a rest for a bit. Perhaps an LT4 hot cam and some heads are in my future though, we will see.
Today ordered a new steering box and will put that in within the next week. In the meantime I am waiting for the seat brackets and trying to fix my high idle problems. I suspect it is a combination of the IAC and a vacuum leak.
~Steven
Today ordered a new steering box and will put that in within the next week. In the meantime I am waiting for the seat brackets and trying to fix my high idle problems. I suspect it is a combination of the IAC and a vacuum leak.
~Steven
Senior Member
Joined: Feb 2009
Posts: 885
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From: USA
Car: 1989 SS
Engine: LT1+1500$ hooker exhaust
Transmission: T56
Axle/Gears: 3.42 bogger
Re: first engine swap- LT1/T56
After the cage, seats, and harnesses are installed I may need to give the wallet a rest for a bit. Perhaps an LT4 hot cam and some heads are in my future though, we will see.
Today ordered a new steering box and will put that in within the next week. In the meantime I am waiting for the seat brackets and trying to fix my high idle problems. I suspect it is a combination of the IAC and a vacuum leak.
~Steven
Today ordered a new steering box and will put that in within the next week. In the meantime I am waiting for the seat brackets and trying to fix my high idle problems. I suspect it is a combination of the IAC and a vacuum leak.
~Steven
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Haven't had the car at any races yet. This summer I will likely start trying her out at auto x and maybe a few passes on the quarter mile.
Compared to the previous motor there was a world of difference with the bone stock LT1. I still havent made any significant changes to the stock motor other than supporting mods, and the car is a blast to drive.
I suspect it could be made even faster with a proper day being tuned by somebody that knows what they're doing.
~Steven
(I will post pics later of my t-tops since I painted the side bars today with the nice weather- also installing a new IAC and steering box tonight after I pick up a pitman puller)
Compared to the previous motor there was a world of difference with the bone stock LT1. I still havent made any significant changes to the stock motor other than supporting mods, and the car is a blast to drive.
I suspect it could be made even faster with a proper day being tuned by somebody that knows what they're doing.
~Steven
(I will post pics later of my t-tops since I painted the side bars today with the nice weather- also installing a new IAC and steering box tonight after I pick up a pitman puller)
Senior Member
Joined: Feb 2009
Posts: 885
Likes: 0
From: USA
Car: 1989 SS
Engine: LT1+1500$ hooker exhaust
Transmission: T56
Axle/Gears: 3.42 bogger
Re: first engine swap- LT1/T56
Haven't had the car at any races yet. This summer I will likely start trying her out at auto x and maybe a few passes on the quarter mile.
Compared to the previous motor there was a world of difference with the bone stock LT1. I still havent made any significant changes to the stock motor other than supporting mods, and the car is a blast to drive.
I suspect it could be made even faster with a proper day being tuned by somebody that knows what they're doing.
~Steven
(I will post pics later of my t-tops since I painted the side bars today with the nice weather- also installing a new IAC and steering box tonight after I pick up a pitman puller)
Compared to the previous motor there was a world of difference with the bone stock LT1. I still havent made any significant changes to the stock motor other than supporting mods, and the car is a blast to drive.
I suspect it could be made even faster with a proper day being tuned by somebody that knows what they're doing.
~Steven
(I will post pics later of my t-tops since I painted the side bars today with the nice weather- also installing a new IAC and steering box tonight after I pick up a pitman puller)
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
I'm glad to hear that my project helped!
and also- the new IAC brought my idle back to around 700-800 rpm
now im in the middle of replacing the steering box- maybe ill finish while its still 2011- gotta get in that last part of the year.
~Steven
and also- the new IAC brought my idle back to around 700-800 rpm

now im in the middle of replacing the steering box- maybe ill finish while its still 2011- gotta get in that last part of the year.
~Steven
Senior Member
Joined: Feb 2009
Posts: 885
Likes: 0
From: USA
Car: 1989 SS
Engine: LT1+1500$ hooker exhaust
Transmission: T56
Axle/Gears: 3.42 bogger
Re: first engine swap- LT1/T56
There is only one thing though that i have to ask, sorry if i missed it but whats up with the sluggish starts? Was the battery low or was you using a fat starter? It just seemed like it was dragging more then it should.
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56




old power steering box out right before i transferred the fittings and pitman arm over.
after more careful inspection it became obvious that the slop in my steering is from the rag joint not the gear itself- no worries because the new box is still an upgrade to the 2.5 turn quick ratio.
going to pick up a new rag joint to rebuild it tomorrow and put it all back together.
Happy 2012
~Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Finished the steering project today. New box is in and flushed/filled, and the new rag joint is assembled and installed.
The rag joint was a bear to work on- drilling out the four rivets was the most time consuming part of the entire day. After that things werent too difficult other than the pain of getting the pitman onto the new box.
here is a picture of the new rag joint I assembled

After bleeding the air and whatnot the steering felt effortless at the wheel- something I have never experienced with this car. It was almost disconcerting.
Didn't get the chance to really drive her and see how it fares- I will get out tomorrow and find out just how different it is. I also confirmed that this box is indeed 2.5 turns lock to lock (I have heard of reman parts claiming to be quick ratio and in fact not be, not the case with this autozone piece)
~Steven
The rag joint was a bear to work on- drilling out the four rivets was the most time consuming part of the entire day. After that things werent too difficult other than the pain of getting the pitman onto the new box.
here is a picture of the new rag joint I assembled

After bleeding the air and whatnot the steering felt effortless at the wheel- something I have never experienced with this car. It was almost disconcerting.
Didn't get the chance to really drive her and see how it fares- I will get out tomorrow and find out just how different it is. I also confirmed that this box is indeed 2.5 turns lock to lock (I have heard of reman parts claiming to be quick ratio and in fact not be, not the case with this autozone piece)
~Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Wow. It's like having a whole new car with the new rag joint and box. The steering effort is so low its crazy, and there is no more wandering and looseness in the steering. I finally feel in control of the car!
That combined with the proper idle made driving today a blast
I might try to fix my speedo or a few other little things in the coming days but really I'm good until the seat brackets come and the cage gets welded in.
~Steven
That combined with the proper idle made driving today a blast

I might try to fix my speedo or a few other little things in the coming days but really I'm good until the seat brackets come and the cage gets welded in.
~Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Everything is pretty much sorted out at this point with the seat brackets (they took a month to make it to me...), the cage, and the harnesses.
I have also opted for a whole new set of black carpet to be installed/modified with the cage.
The car is going in next Monday and should be done within a week with the new cage, seats, harnesses, and carpet- I can barely contain myself.
Pics to come,
Steven
I have also opted for a whole new set of black carpet to be installed/modified with the cage.
The car is going in next Monday and should be done within a week with the new cage, seats, harnesses, and carpet- I can barely contain myself.
Pics to come,
Steven
Junior Member
Joined: Jan 2012
Posts: 23
Likes: 1
From: Round Rock TX
Car: 1989 IROC-Z
Engine: LT1
Transmission: T56 six speed manual transmission
Axle/Gears: Auburn posi unit with 3.73 gears
Re: first engine swap- LT1/T56
It has been great reading through this thread and getting a better understanding of just what is involved in these LT1/T56 swaps. I'm picking up a 89 Iroc that's already been converted so my only real project will be reversing the factory AC delete. (I live in TX and AC is required Convertible or not
)
Truely an amazing effort and I'm quite glad you took the time document your journey.
) Truely an amazing effort and I'm quite glad you took the time document your journey.
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
thanks alot- this project has been amazing for me over the last two years.
I just got a sneak peek from the shop this evening

~Steven
I just got a sneak peek from the shop this evening


~Steven
Last edited by kthxbai; Jan 24, 2012 at 06:53 PM.
Thread Starter
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Joined: May 2009
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
Another photo confirms that I am rust free along my floors (sigh of relief)
~Steven
~Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
harness bar is in- they just have to fit the door bars and then zip everything up
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56


They should be done with the whole thing tomorrow afternoon. My brother should have the car picked up by wednesday at the latest.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
My brother picked the car up a few minutes ago and we are ready to get going on the suspension as soon as we order parts.
The plan at the moment is a full set of Koni yellows, ground control weight jacks with 850ish lb front springs and 175ish pound rears (still deciding on rates), and adjustable upper strut mounts.

~Steven
The plan at the moment is a full set of Koni yellows, ground control weight jacks with 850ish lb front springs and 175ish pound rears (still deciding on rates), and adjustable upper strut mounts.

~Steven
Last edited by kthxbai; Feb 7, 2012 at 06:48 PM.
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56

try earlier in the thread for more info, here is a good picture of the water pump connections. heater hoses run from the core on the passenger side up to the pass. side of the radiator.
Just ordered a set of Koni yellows for the car today

~Steven
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
ground control weight jacks, 825lb fronts, 125lb rears, and j&m upper strut mounts on the way.
I'm really excited to lower the car and drive with a real suspension setup. Also bought LCA relocation brackets, now just need to swap out my PHB for an adjustable one.
~Steven
I'm really excited to lower the car and drive with a real suspension setup. Also bought LCA relocation brackets, now just need to swap out my PHB for an adjustable one.
~Steven
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Joined: Jul 2004
Posts: 84
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From: St Catharines
Car: 1987 IROC
Engine: LS1
Transmission: T-56
Axle/Gears: 3:42, 10 Bolt LT1
Re: first engine swap- LT1/T56
I really like what you did with your car. I'm in the process of doing the same to my '89. I was wondering if you had some part numbers for the exhaust, I want to do something similar. Did you get the parts from summit? Thanks for any help.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
the x-pipe and heddmen extensions were from summit- I had bought a universal xpipe kit roughly a year before I built the exhaust... I think the whole kit ran me ~100 dollars. The heddman extensions are ball and socket to match my headers, and they were roughly 30 bucks. The rest of it I made out of straight stock pipe. I ordered 8 feet of 2.5" pipe and 4 feet of 3" pipe then went to town cutting and welding.
Steven
Steven
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: first engine swap- LT1/T56
My brother just finished the install of my konis, weight jacks and upper mounts. He put the jacks all the way down to see how it looks and here it is:




on to the fronts:



and FINALLY:



Better pics of the whole car (plus it needs a bath) at some point soon.
Steven




on to the fronts:



and FINALLY:



Better pics of the whole car (plus it needs a bath) at some point soon.
Steven
Last edited by kthxbai; May 1, 2012 at 01:15 PM.











