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I've been kicking aroud the idea of using an Eaton M122 supercharger (used on the new Shelby Mustangs) for a blow through carb application, has anyone done it? I see them as almost new take offs on EBay for the $600 mark (which seems pretty cheap to me). Plus they seems to make pretty decent power. I've stumbled across some guys on the net useing them for blow through EFI apps (5.0 Mustangs) but no carbs. I'm thinking there shouldn't be any issues since turbo and centrifigal blower guys do it all the time. The only thing that's bothering me is that the M122 is a roots blower so it builds boost right now, unlike a turbo or centrifigal that is more gradual, would that cause any type of issue?
I would be putting this on a stock smog 400 with low boost (6-8 lbs) but cranking itup when the motor gets a rebuild with forged stuff, I would also be using an intercooler. Converting to fuel injecte would be a possibility somewhere in the distant future. The car is a 67 Coronet and I was thinking of mounting it on the passenger side of the engine for better weight distribution.
I know that it would take alot of fab work but that's no issue, I've got a decent mig, plus a mini mill, mini lathe, etc (machinist by trade), so that doesn't scare me or turn me off of the idea.

Why not mount it above straight above the motor and make it suck through the carb ? Like a real roots blower




That was the original plan, BUT, Eaton doesn't recommend putting fuel through their blowers (the gas corrupts the seals and it would eat the bearings) plus others claim that they're prone to exploding if fuel is put through them (don't know if that's true or not, it's just what some claim). Also things would get pretty tall if you intercooled it in a conventional draw through. The M122 also has a bypass valve in them for vacum conditions so they don't heat up and it makes them draw like 3 hp in non boost conditions for better fuel mileage (not a big concern but still a selling point in the big picture), and I don't think the bypass would work to well in a draw through application. It's basically a small butterfly valve (think small one barrel carb size) that is pulled open by vacum and bypasses the rotors). A guy tried not using the bypass on a blow through 5 litre (fuel injected)with a M112 and the blower got really hot.

MrYuck, I've also been looking at the centrifigal's and that's not out of the picture, but I'm drawn to the M122 more at this point, they seem able to put out some good horsepower stock, and more if you get them ported (they're some seriously fast Shelby's running the stock blower). Plus if anything goes wrong with it, parts are plentiful and cheap, not sure if that's true with the older used centrifigal's.