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2.8 Substitutions

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Old Sep 14, 2025 | 09:40 PM
  #1  
Woodworks's Avatar
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2.8 Substitutions

Hi everyone, newbie here. I recently purchased an MGB with a swapped 2.8 V6 which apparently was sourced from a 1984 Camaro. I plan to rebuild the engine but in the meantime would like to source out a replacement motor. There don't seem to be a lot of available 2.8's sourced from 84 Camaros where I live. Can someone please educate me and let me know what other cars had the same engine, I've heard the S10 and maybe a Fiero? This might help me in my search! The 2.8 obviously fits nicely and all the mounts etc. are in place so not sure if I want to deviate from that, but always open to suggestions. Thank you in advance!
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Old Sep 15, 2025 | 07:21 AM
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From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: 2.8 Substitutions

Have you searched for a 3.1? It *should* fall right into the 2.8 spot. They were the same design, just larger displacement for the newer engine. Even the later 3.4 might fall right into place, but I'd suggest researching any differences to know what you're getting into.
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Old Sep 15, 2025 | 10:16 AM
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8t2 z-chev's Avatar
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From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: 2.8 Substitutions

would have to be f-body or S10 - Fiero is transverse engine. Some say the shorter stroke of the 2.8 makes it more satisfying to drive with a stick transmission..
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Old Sep 17, 2025 | 10:10 PM
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Re: 2.8 Substitutions

Thanks Alice, that's very helpful! I will do more research on the 3.1 if it does have the same block and mount points that would be perfect!
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Old Sep 18, 2025 | 01:41 PM
  #5  
pirateofms's Avatar
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From: Western WA
Car: 1989 Firebird
Engine: 2.8 V6
Transmission: T-5
Re: 2.8 Substitutions

Originally Posted by Woodworks
Thanks Alice, that's very helpful! I will do more research on the 3.1 if it does have the same block and mount points that would be perfect!
My understanding is the f-body (and I think s10) 2.8, 3.1, and 3.4 iron head blocks are all interchangeable. You can bolt your current heads and intake to any of those three. Go check out https://www.60degreev6.com/ and look around, they're completely focused on that motor.
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Old Sep 19, 2025 | 08:12 AM
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From: upstate NY
Car: 1989 Firebird
Engine: 2001 5.7 LS1
Re: 2.8 Substitutions

If Interested I have a 2.8 multi port with 12,600 miles on it if interested, I also would include the harness and computer. I also have the auto transmission with the same milage.
I would take $800 for both plus freight
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