3400 swap in 96 z26

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Cam2363
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3400 swap in 96 z26

Postby Cam2363 » Mon Sep 16, 2019 10:37 pm

After the unfortunate event of my engine blowing up, it's time to upgrade! I'm gonna be putting a 3400 in from a 99 grand am. I plan to redo the timing, every gasket, water pump, front and rear main seals, and belt and tensioner. I figure if it's out, why not do it, and I should also just do it right the first time instead of skipping out and having bigger issues in the future.

The first step is to obviously get my engine out, and with great difficulty, I did just that.

Now that its out, I started to take a bunch of parts off that I need, and I plan to strip it completely tomorrow to get a nice close look at how it all works and get a bunch of cool things to use for decorations or whatnot haha.

The next step then will be to clean the years of grease and oil off my engine bay and trans. I will also fix any spots that are missing some paint just to make sure no rust occurs where it already isnt.

Im open to any other ideas or tips I should do or follow!

I'll update this as I make more progress. As it sits now, I'm getting the new engine on Saturday ImageImage

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Re: 3400 swap in 96 z26

Postby Cam2363 » Mon Sep 30, 2019 9:57 am

Things are well. Only issue is that the rear manifold from the 3400 is different. So that would need to be left as the stock beretta one, or an after market one. Otherwise, everything so far has been very easy. Just time consuming

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Re: 3400 swap in 96 z26

Postby heavywoody » Wed Oct 02, 2019 8:38 am

I ran my stock rear manifold for years so I didn't have to change the exhaust. If you keep the stock 3400 one, add some heat wrap around the steering gear bellows so they don't melt with the manifold being closer to the rack.


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95 Z26 Turbo 3400 5spd - R&D Project
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Re: RE: Re: 3400 swap in 96 z26

Postby Cam2363 » Wed Oct 02, 2019 10:19 am

heavywoody wrote:I ran my stock rear manifold for years so I didn't have to change the exhaust. If you keep the stock 3400 one, add some heat wrap around the steering gear bellows so they don't melt with the manifold being closer to the rack.
I changed to the stock 3100 beretta one. Just easier for me as I didnt have the right down pipe for it.

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Re: 3400 swap in 96 z26

Postby Cam2363 » Fri Oct 04, 2019 10:07 am

Overall, if anyone else ever wants to attempt this. It was surprisingly easy. The only difficulty was getting the engine and trans mounted together, with the trans still in the car. Other than that, everything went smoothly. Just some stuff took longer than it should have. But it's still done. The only issue I ran into was with the heater hoses, the 3400 one was different and when I tried to get it connected, I broke off the barb on the heater core, but as long as you dont pull it. You will be fine.

What I did for the heater part was use the 3400 pipe, then get the hose from the 3400 which had the quick disconnect, took the 3400 hose part off the adapter, connected a normal heater hose, and then you would have to run it down there and use a 90° 5/8 to 5/8 adapter to get them hooked up.

I tried to use a straight barb, but that's what ended up causing the break, use a 90° to avoid hoses bending at weird angles and having to force things.

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Re: 3400 swap in 96 z26

Postby heavywoody » Sun Oct 06, 2019 10:45 am

You can use the stock Beretta heater hose connection, you just have to thread the lower intake manifold to accept the fitting. I believe it was a 3/4" NPT.


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Re: RE: Re: 3400 swap in 96 z26

Postby Cam2363 » Sun Oct 06, 2019 1:42 pm

heavywoody wrote:You can use the stock Beretta heater hose connection, you just have to thread the lower intake manifold to accept the fitting. I believe it was a 3/4" NPT.
Yeah I know I could, but that's more work and I didn't wanna risk damaging it or anything.

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Re: 3400 swap in 96 z26

Postby woody90gtz » Tue Oct 08, 2019 10:20 pm

When I did my first 3400 swap I actually the Beretta pipe and the 3400 pipe and coupled them with a piece of rubber heater hose. Ghetto but it worked fine until I redid the swap in the next car. Right now I actually have a brass barb in the intake and a molded 90 degree heater hose. I like that even better.


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91 "SS" WOT 3400/5spd - 13.57@100.7 GEARHEAD dezign

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Re: RE: Re: 3400 swap in 96 z26

Postby Cam2363 » Tue Oct 08, 2019 11:25 pm

woody90gtz wrote:When I did my first 3400 swap I actually the Beretta pipe and the 3400 pipe and coupled them with a piece of rubber heater hose. Ghetto but it worked fine until I redid the swap in the next car. Right now I actually have a brass barb in the intake and a molded 90 degree heater hose. I like that even better.
I saw the barb mod you did. Definetly love that more than the original connection method. But that's how its gonna be for me. Ghetto hoses and barb connectors lol

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Re: 3400 swap in 96 z26

Postby Rettax3 » Wed Oct 09, 2019 2:28 am

I had a pretty good write-up with pics back on the old bstuff site showing the 3400 intake I put on my 'old' Z's 3100. I also used a 3/4" NPT thread tap, and a brass hose-barb for simplicity -I haven't touched it since, now approaching ten years ago. I replaced the quick-leak, err, I mean, quick-connect fitting on the 'new' Z's 3.4 four-cam with a brass flare-type adapter, and used aluminum tubing from there, but I also have a 3-inch exhaust pipe sitting there, so I was avoiding rubber in that area. GM's only real reason for those quick connectors is for faster production assembly, and GM's only real reason for making them out of cheap-@$$ pot-metal is because they are cheap @$$es. :pardon:


1989 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26

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Re: RE: Re: 3400 swap in 96 z26

Postby Cam2363 » Wed Oct 09, 2019 8:52 am

Rettax3 wrote:I had a pretty good write-up with pics back on the old bstuff site showing the 3400 intake I put on my 'old' Z's 3100. I also used a 3/4" NPT thread tap, and a brass hose-barb for simplicity -I haven't touched it since, now approaching ten years ago. I replaced the quick-leak, err, I mean, quick-connect fitting on the 'new' Z's 3.4 four-cam with a brass flare-type adapter, and used aluminum tubing from there, but I also have a 3-inch exhaust pipe sitting there, so I was avoiding rubber in that area. GM's only real reason for those quick connectors is for faster production assembly, and GM's only real reason for making them out of cheap-@$$ pot-metal is because they are cheap @$$es. :pardon:
You are right. But that's just gm!

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