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Reload this Page 1986 305 TPI to a 1987 V6 Grand National

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 07-22-2009, 03:59 PM   #1
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Join Date: Jul 2009
Location: Memphis, TN
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Car: 1986 IROC-Z
Engine: 305 TPI
Transmission: 700r4

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1986 305 TPI to a 1987 V6 Grand National
I currently have a 1986 IROC-Z 305 TPI engine. I want to know if it's possible, without major modification, to install a V6 turbo-charged engine out of a 1987 Buick Grand National. I'm told from a friend that engine/tranny mounts, wiring harness, etc... are identical and this would be an easy drop in. Any help would be greatly appreciated. Thank you.
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Old 07-23-2009, 05:14 PM   #2
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Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 33,342
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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http://www.thirdgen.org/buick-3.8L-t...ne-swap-f-body

I think you'll soon see that what you were told is not completely accurate.
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Old 07-24-2009, 11:07 PM   #3
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Car: 1986 IROC-Z
Engine: 305 TPI
Transmission: 700r4

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Re: 1986 305 TPI to a 1987 V6 Grand National
Five7kid, Thank you for the reply. I guess I'll look at putting in a 350 afterall. What I've seen however is that it has to be a certain year 350 if I want to use my current harness. Something about the heads/intake manifold for the 1986 I believe.
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Reload this Page 1986 305 TPI to a 1987 V6 Grand National
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