Ferrari built a series of highly-tuned race engines based on the specifications of the cars campaigned in the Mille Miglia races. These cars were equipped with three four – barrel carburetors. Again the coffee can assembly was used with the satin painted steel tops and bottoms with the nickel – plated perforated steel sides. These air cleaners were made by F.I.S.P.A and used a single small aluminum tag, 11mmx60mm, riveted to the perforated side panel. Four-Barrel “MM” F.I.S.P.A air cleaner tag.
From the early 1950s until about the time of the introduction of the outside plug 250 engines in 1959, Ferrari used the black Magneti Marelli B-7 design coils. These were slightly larger than the B-5s and again had the mounting bracket spot welded onto the cans. The whole assembly was painted satin finish black and the aluminumB-7 tags were attached to the bracket with two tiny “u-drive screws.” The usual practice was to cut off the ends of the aluminum tags, at a 45-degree angle, near the end of the lightning bolts and then attach them with one rivet on each tab. I have alos seen original pieces with full-length tabs and using two rivets on each tab. Blue aluminum Magneti Marelli B-7 coil tags.