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Old April 23rd, 2007, 03:00 PM
rgrrvr's Avatar
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DJ Menasco is The Dude
1995 D90
Join Date: Apr 2007
Location: PNW
Posts: 455
3.5 vs 3.9

So I am wondering how much difference in performance and power there is between the 3.5 and 3.9 V8 motors. I have a 3.5 in my garage that I was planning on putting a cam and tricking the heads, but now a friend has come across a 3.9 and I could get it for a good price. Should I stick with the original plan or go for the 3.9? If I go for the 3.9 should how much should I tweak it for performance. All of this is being done on a budget and the 3.5 mods would cost what I'd get the 3.9 for. Just wondering what you guys think.


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Old April 23rd, 2007, 03:13 PM
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Mike Hippert
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94 D-90 Grinding Rover
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,790
Go 3.9, you can have the one sitting in my parents driveway for FREE! Come pick it up! Just needs a little work but if you're rebuilding it you're all set.

OK are you talking about the difference between a carbed 3.5 and a Fuel injected 3.9? I've driven both, and there is a good difference between the 2!

3.5 carb ~100 HP
3.5 EFI ~150 HP
3.9 EFI ~187 HP

Those are the starting #s but, short of forced induction there is no substitute for displacement!
Don't forget to Search first then ask questions later! The loose nut behind the wheel
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