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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.

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Old 10-08-2009, 10:42 PM   #1
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Join Date: Aug 2009
Location: Grand Terrace,CA
Posts: 27
Car: 91 firebird/68 Camaro
Engine: 3.1L V6/Ram jet 350 crate
Transmission: T-5/L60E
Axle/Gears: 7.5 10 Bolt/3.90 posi

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3.1 V6 to a 350 swap

I am getting rid of the stock 3.1 v6 for a 350 block. My quick question to all the motor gods in here is this.... will it fit the stock motor mounts or will I have to modify my mounts? It is a 1991 firebird stock.


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Last edited by Pyronight; 10-09-2009 at 05:01 PM.
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Old 10-09-2009, 08:35 AM   #2
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Join Date: Sep 2002
Location: Cary, North Carolina
Posts: 2,513
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi

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Re: 3.1 V6 to a 350 swap

Don't know if the mounts are different - a check of part numbers at autozone.com would tell you. I do know they need to move forward as the V8 is longer, but there are mount holes already in the subframe.

Try - there's a ton of threads and stickies on V6 to V8 swaps.
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Old 10-09-2009, 03:45 PM   #3
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Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 33,372
Car: 82 Berlinetta(2)/57 Bel Air
Engine: 86 LG4-> ZZ3(LS1)/mild 396
Transmission: TH700(T56)/TH400
Axle/Gears: 10-bolt 3.23(4.10)/8.2" 10-bolt4.11

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The info is in the V6 to V8 swap sticky in the top section of this forum.
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