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PostPosted: Wed Oct 18, 2017 10:02 pm 
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Joined: Wed Oct 18, 2017 9:56 pm
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Year and Trim: 1997 Pontiac Bonneville SE 40th Year Ann.
I've got a 97 Bonneville SE with the N/A L36 3800 Series 2 with a bad wrist pin in the 1st cylinder. I've been looking for another car with a Series 2 that maybe has a bad transmission or body to swap it with,but I found an 04 Grand Prix with the Series 3. I know they are basically the same engine at the core and was wondering if I could drop the Series 3 into my Bonneville without any major complications.


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PostPosted: Wed Oct 18, 2017 11:01 pm 
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Joined: Wed May 21, 2008 11:47 pm
Posts: 6015
Location: Philly
Year and Trim: 95 SLE
Yes, this has been done many times. The easiest thing to do is swap all the accessories, oil filter adapter, exhaust manifolds, upper intake with throttle body, and fuel rail with injectors from your car onto the engine.

Be sure to inspect your upper intake manifold for damage where the coolant ports travel past the EGR tube. When this area fails, it sends coolant into the engine. I've filled these ports with JB Weld in the past so I didn't have to worry about it. In the past 15 years I've never read about anyone having issues from blocking these throttle body warming ports.

Also replace the plastic coolant elbow that goes from the lower intake to the tensioner assembly with the aluminum dorman one.

There are ways to get the aluminum upper intake working but it requires an adapter and some external pluming to retain the PCV system.

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95 SLE... a keeper. 241k miles. Low and Slow.
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
74 Yamaha DT175: brap brap, brap
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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PostPosted: Fri Oct 20, 2017 9:57 am 
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Joined: Mon May 10, 2010 6:11 pm
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Location: Chicago, IL
Year and Trim: 2003 SLE
The L36 and L26 are practically identical, and you can make them exactly the same by swapping on the H-body accessories as mentioned above.

Another L36 will do just fine as well, and only needs to have a small handful of issues addressed in order to be "bulletproofed"

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-Car Guy Carl
"Penelope" - 2003 SLE - 180k Miles
"Sydney" - 2000 Honda S2000 - 59k miles
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PostPosted: Fri Oct 20, 2017 10:44 pm 
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Joined: Wed Oct 18, 2017 9:26 pm
Posts: 39
Location: Martinsburg, IN
Year and Trim: '03 SLE Silver/Charcoal
I had an '04 GP once upon a time and considered this swap into my 02 SLE however I was considering making it fly by wire as well.... After buying this 03 Yukon that is fly by wire and spending well over a grand to have the wiring harness grounds reworked to keep it from randomly going into "Reduced Power" I am happy that I chose not to go fly by wire... Coincidentally the wiring fix repaired the "Battery Not Charging" message too...

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2002 SLE "Frankenbonnie" 02 engine, 04 transmission, and a 03 PCM to make everything talk. Sadly I know longer own
1993 Suburban Zombie Apocalypse Assault Vehicle (GMC Edition)
2003 Yukon Black/Charcoal cloth 4x4 POW/MIA
2003 SLE Silver/Charcoal (New Acquisition)


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