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About the single / dual carby thing...
The single carbed B20s that came from Volvo were running a single SU, and also (I believe) milder cam timing and less compression. The Weber carb you have on your engine is an aftermarket carb. Although it is not a performace carb, you would not gain 28HP by simply going to dual SUs (MAYBE 5HP??). The Weber actually has more breathing capacity than an unmodified B20 can use, but it is not a performance carb and it will not have the top end power or drivability of a properly tuned set of SUs.
Personally I have a very strong dislike for the Weber DGV series carb and prefer dual SUs. I know some folks who hate SUs and prefer the Weber. If you like the Weber stick with it. If you want to try some SUs I'm sure somebody on the board has an extra set to sell. Make sure you get a good set, or are willing to have them refurbished or your SU experience will be a bad one.
The disk brake 1800E/ES rear end has a ratio of 4.30. As stated before, the braking advantage is minimal unless you race. Having read your prevous post, I suggest you rev your engine more before shifting if you are looking for more power. The shift points you used were extremely mild.
Most importantly, have fun with your new toy. The 122 is one of my absolute favorite Volvos and my driveway feels empty when I don't have one parked there.
Ron Tewksbury
1968 122s
1979 244 DL
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