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.

How hard would this swap be?

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Old Nov 15, 2010 | 06:36 PM
  #1  
themanricky1117's Avatar
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Joined: Aug 2010
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From: Fort Myers, Florida
Car: 1989 Pontiac Firebird Base T Top
Engine: 305 V8 carb
Transmission: 700r4
How hard would this swap be?

hi. i was going to replace my 1989 firebird's 305 tbi engine with this new one: http://www.gmperformanceparts.com/En...case/index.jsp how hard would a swap like this be? and could i still use the same factory automatic transmission?
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Old Nov 15, 2010 | 06:57 PM
  #2  
talover111's Avatar
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Joined: Feb 2007
Posts: 122
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From: pennsylvania, united states
Car: 1985 & 1988 trans am
Engine: 350 tpi ; 355
Transmission: 700r4 auto; converting to 6 speed
Axle/Gears: 9 bolt 3:27 posi; 2.73 open
Re: How hard would this swap be?

yes u could use the tranny u already have although u may want to upgrade it by installing a shift kit
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Old Nov 16, 2010 | 01:36 PM
  #3  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Your intake manifold would have to be modified in order to bolt to the heads on that engine.

The crank is the old 2-piece rear main seal type. Yours is the later 1-piece type. Your flexplate won't fit the new engine. If you get one for an '82-'85 f-body V8 automatic application, it will fit the engine and your torque converter.

This one would bolt in http://sdparts.com/details/gm-goodwr...gines/12568758, although you may need to do some computer tuning (true with the other engine as well).

Your stock TBI exhaust will hold back any engine you install in the car.
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Old Nov 18, 2010 | 09:39 PM
  #4  
themanricky1117's Avatar
Thread Starter
Junior Member
 
Joined: Aug 2010
Posts: 16
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From: Fort Myers, Florida
Car: 1989 Pontiac Firebird Base T Top
Engine: 305 V8 carb
Transmission: 700r4
Re: How hard would this swap be?

i was going to get a different intake manifold and use a carb... less complicated
i dont know about the flexplate though
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