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Old 10-11-2011, 06:23 PM   #1
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Wink Bonneville Engine Swap

I have a 2000 bonne Ssei, all stock. Has about 70,000 miles on it. Could I swap in a 4.6 Northstar from a latter Bonneville model or would a 2000 year 4.6 from another H body car work? How many mods would be needed
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Old 10-12-2011, 08:35 AM   #2
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A few have proposed swapping a N* into one. I'm not sure if anyone has. The L67 motor would be an easier swap with potential for more power.
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Old 10-12-2011, 12:19 PM   #3
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Don't I already have that, the 3.8 supercharged?
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Old 10-12-2011, 12:24 PM   #4
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Yes you do. But you can do more with the L67. The N* has no real mod options. You would also need to look at swapping the transmission from the 4t65e-hd you have now to a 4t80. Not sure what would need to be done about axles and hubs. There will be wiring to change. Not sure how the N* PCM will match up to the 2000 SSEi setup. Anything can be done, just a mater of time, money, and knowledge.
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Old 10-12-2011, 12:33 PM   #5
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So with the L67 how could i get it up to sounding like a V8 like a N* and the hp
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Old 10-12-2011, 12:50 PM   #6
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Your not going to get it sounding like a V8. There will always be a mid range rasp. But with ported intakes, a good cam, headers, and open exhaust you will get a good deep tone and idle and low power acceleration. A supercharged engine also has a lot of torque. 300hp to the wheels is very possible, and even more.
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Old 10-13-2011, 12:42 PM   #7
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if i do all that ill prolly be around a grand
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Old 10-13-2011, 04:04 PM   #8
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If you put a cam in your L67 it will sound kinda like a v8. But not really. Go to YouTube and searched calmed GTP or Bonneville with the l67 or 3.8s.
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Old 10-13-2011, 06:35 PM   #9
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Yeah Ik what a cammed will sound like, well thanks
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Old 10-13-2011, 10:57 PM   #10
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I say stay with the 3.8. They' re moddable and reliable and a ton of fun with the mods Danthurs listed
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