Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

84 firebird

Old Oct 23, 2021 | 09:05 AM
  #1  
Bobby Suth's Avatar
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Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
84 firebird

I need to change my engine. It died. The 305 locked up. Carburator isn't the right one and that may have been the cause. I have a 305 out of a 89 fb. The dash wiring won't let me drop it in as is. Need options
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Old Oct 23, 2021 | 10:32 AM
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 84 firebird

The 305 should essentially be the same once you swap all the accessories like the intake manifold, alternator, water pump, exhaust manifold and all those things. What is holding you up?
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Old Oct 23, 2021 | 06:26 PM
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Bobby Suth's Avatar
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: 84 firebird

Intake manifold bolt holes are drilled at a different angle I read. Other than that I need a new carburator. Will a edelbroc fit the stock intake. Most have electric choke. How does that play out?
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Old Oct 23, 2021 | 06:28 PM
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Re: 84 firebird

Easiest thing usually is to look at everything that's different between the motor you have and the motor you want to put in; take everything that's different off of the one you have; and put ithe stuff from the one you already have onto the one you want to put in. Usually by the time you get down to the end of that, the things that are incompatible, are minimized, and MUCH easier to identify and deal with, than "how do I put this motor that has all this different stuff on it into my car", and demanding that the Internet spoon-feed you all the details for whatever exact combination you might happen to have.

I'm well aware that this is a foreign concept to humans in general, but it's known as "logic". You're smart enough to step up to that superior plane of existence if you want.

Last edited by sofakingdom; Oct 23, 2021 at 07:02 PM.
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Old Oct 23, 2021 | 06:35 PM
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 84 firebird

Slot the intake holes and get a stock quadrajet forget edelbrock carbs exist. Next issue?
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Old Oct 23, 2021 | 11:33 PM
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Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: 84 firebird

Expensive and not currently in stock, but this intake manifold would work on the new engine...
https://www.summitracing.com/parts/e...make/chevrolet

Modifying the original intake would probably be more cost effective...
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Old Oct 25, 2021 | 06:47 AM
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Bobby Suth's Avatar
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Posts: 989
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: 84 firebird

Thank you. I think I will just try to find a stock carb and go!
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