Does anyone have experience with these as opposed to SU carbs?

 

Redline is a Weber carb distributor - are you thinking of going with a side draft or 2 bbl down draft? Never did a weber conversion on a B20 but did on a couple of BMW 2002s back in the day. Things to look for - does the factory manifold have a preheat (BMWs ran coolant so the conversion included a bypass). Assume you have a manual choke? If you go with dual side drafts do you have a flow meter to sync the carbs? Are you running a stock engine or cam+header - if so you'd need to research jet size. Finally whats your plan for air filters? the downdraft is easy at the kits usually has a retangular box that sits on top. Side drafts you may need to check for clearance - particularly if you go for motorcycle style cone filters. Stock engine will run great with the 2 bbl downdraft. only downside is you give up the pre-heater. When I did the side drafts, I also did a header and 292 cam. Probably got 140 HP out of the 2.0L four so you can expect the same with the Volvo :-) Have you considered doing a fuel injection kit?

 

I am thinking of picking up a dead unloved 122 and it would seem that if the carb-manifold kit is cheap, it would be the way to go.
My Hoopty is my theme song

 

It a 2 bbl downdraft.

 

cool, they have a kit with the 32/36 weber carb that should bolt right onto the factory manifold no real upside to replacing the manifold but a new carb will really help driveability. Only question is the stock choke set up and what you want in the replacement.

 

This is a redline kit manifold with a down draft carbureator. Will it clear the hood on a 120 series volvo?

 

Yes - it should be same or less than the factory air filter. My point about fit was more about converting to side drafts where you'd need to plan for the filters extending from the barrels.

 

The conversion is considered because the su's on the car are 63 years old and I wonder about the wear on throttle shafts and vacuum slides. Have not yet heard it run, and has been off the road for 5 years.
I can buy a used redline set up,off a b20 engine, but would I have to rejet? The 66 122 has a b 18.with twin su's

 

rejetting is only needed if you change the engine's set up ie adding a hot cam or headers. I agree that old carbs would need a rebuild (gaskets, needle valves, jets, float etc are in the kits) but that won't fix a carb with a worn shaft so just replacing with a new in the box 32/36 Weber would be a good way to get top reliability. If you are getting a used after market carb and a manifold then its not likely to have a worn shaft so that carb should clean up nicely with a rebuild kit.