Cool! But, take a close look at the blower case. It's a Pete Robinson magnesium case that also has cut out the traditional GMC mounting. Here's the story as GN7 relates from another forum:
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Jerk, this requires a little explaining, so sit tight. The first mag blowers were not cast because they were lighter. That was a side benefit. The reason for them back in the day was for the reason Steelcomp ask some time ago about billet rotors and billit cases. Do the same materials gall easier, than if the case cast. I believe yes. I May be wrong, but the idea is plausable. When the rotors and the case are both cast, the answer is yes. Not plausable, FACT!
The first mag cases were cast at GM by Ohio George Montgomery, who worked at GM on the night shift and was able to get someone to pull this off. (Sneaky) Pete Robinson machined them and they both had mag case blowers long before anyone else caught on. They both painted the cases to hide them. The reason was they could fit them tighter and if the rotors touched the cases, it didn't do as much harm to the case, and the rotor took most of it. Back them they didn't strip the rotors, and if you look at a stock GM rotor, there is a rib right where they strip them today. That rib was the sealing edge. If they wore the edge down, they replaced the rotor which was fairly cheap back then. Specially if you worked for GM and you were a racer.
"Today, with teflon stripping(really just bumpers)the ONLY benfit is weight. As to how you should fit it. You shouldn't. You should turn the thing over to someone that knows mag blowers, and you tell them the usage. Not some one that says yeah, there all the same and I do this all the time. Someone like Littlefield, or RBS superchargers. Or, set the thing so loose it just doesn't matter and live with the boost you get. It just doesn't get any simpler than that.
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Kalitta had unlimited Ford $ to get those lightweight mag cases. I do think Kalitta's early SOHC success also got Ohio George to add the SOHC to his Willy's coupe and later the Mustang.
