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3.1L to 4.3L

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Old Feb 20, 2004 | 03:13 PM
  #1  
firefrombelow's Avatar
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3.1L to 4.3L

Got a '91 Firebird, and want some info on a swap...First, How does the 3.1 and 4.3 compare in block size?? Im assuming that I can use the 700R4 tranny...Are manifolds and injectors interchangable between the two?? What is the power potential of the 3.4??

Thanks for your time...
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Old Feb 20, 2004 | 03:39 PM
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Dante93GTZ's Avatar
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From: East Tennessee
Car: 1992 Z28 Heritage Edition
Engine: L98
Transmission: T56
Axle/Gears: 3.23:1
3.1 items such as manifolds etc will not bolt up to a 4.3

The 2.8/3.1/3100/3400 V6's are usually parts interchangeable with each other.

The 4.3 is basically a 5.7 350 with two cylinders whacked off.

700R4 will bolt up to a 4.3 but you might need a different bell housing to make it work.
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Old Feb 20, 2004 | 03:39 PM
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Dante93GTZ's Avatar
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From: East Tennessee
Car: 1992 Z28 Heritage Edition
Engine: L98
Transmission: T56
Axle/Gears: 3.23:1
Originally posted by Dante93GTZ
3.1 items such as manifolds etc will not bolt up to a 4.3

The 2.8/3.1/3100/3400 V6's are usually parts interchangeable with each other.

The 4.3 is basically a 5.7 350 with two cylinders whacked off.

700R4 will bolt up to a 4.3 but you might need a different bell housing to make it work.
4.3 NA power topped out at 190hp.
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Old Feb 20, 2004 | 03:40 PM
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mw66nova's Avatar
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From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
please specify whether you are talking about the 3.4 or the 4.3. the 3.4 is totally interchangable. the 4.3 is about like putting a 350 in the car....minus two cylinders.
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