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Hello everyone, this is my first post. I did this with my 1989 plymouth horizon with a 2.2 TBI 5 speed.
If you want to temporarily try it out, you can go to a junkyard and find gaskets for your car. Stack 5 or 6 together and you'll have a pretty sizable spacer. Thankfully the ones in the dodge 2.2 are 1/8" so i only tried two.
I found it added to the low end. I have no idea what it did for mileage, those were nearing the end of my teenage years so I was more concerned with how many gears I could keep the tires smoking (1st-3rd if you were wondering). I did get it from ~14mpg to just over 30 (still driving like a jerk) with new plugs with a wider gap, oil change, timing advanced 5*, TB spacer, and a better air filter. On a 290k engine, god knows which one of those helped : /
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