The 375 Plus Spyders were factory team cars and were not raced by private entrants before the mid-season of 1954, the chassis was the same as the 375 MM, but the engine was using the crankshaft from the 375 GP car increasing the stroke to 74,5mm and the displacement to 4954,34cc. The compression was raised to 9:21 and the carburetors were changed to 3 46 DCF3 twin choke Webers. The horsepower gain was so small 344 @ 6500 rpm (340 @ 7000 rpm), but the mid-range power and the flexibility were greatly improved.

The 375 Plus Cabriolet was delivered to King Leopold of Belgium. 

... Ferrari 375 Plus Register >>>

0384AM was finalized January 25, 1954, it was used as factory team car by Umberto Maglioli and went of the street during the Giro di Sicilia, the car received a different nose shape, Maglioli was leading in the MM until he was retiring at the Futa pass, but in Silverstone Froilan Gonzales won the Daily Express Trophy. Maglioli started in the 1954 Targa Florio and in Le Mans it was a dnf with Paolo Marzotto and Umberto Maglioli. It was sold in 1954 to Kimberly and raced by him in 1955 for a couple of races before being sold to Howard Hively. Sold to atomic scientist Karl Kleve of Cincinatti in 1958. The car burned, the engine was out of the car, a portion of the car was stolen from Kleve in late 1988. Appears in Brussels, Belgium in the hands of Jacques Swaters, though still on Interpols stolen car list.

Joe Ford emailed:
Howard Hively never bought it, but Jim Kimberly did let Howard race it. Kimberly had a stable of cars, as he could always afford the best and the latest. The 1958 Bill of Sale is from Jim Kimberly direct to Karl Kleve. That same Bill of Sale mentions a small under dash fire, and since the alloy nose, hood, etc are old but not warped or totally melted (we have pics), there was no real fire as that alloy stuff would melt fast. 

Mysteriously renumbered to 0394AM and then back to 0384AM. Theft and ownership claims now in a Cincinnati Court: Swaters vs. Kleve heir.

 ... it all is very cloudy .. The car is today with Jacques Swaters.

0386AM was a factory team car won the GP Agadir with Giuseppe Farina, it dnf in the GP Senegal and was destroyed in the Mille Miglia after breaking in pieces when hitting a tree. The engine is owned by an Italian Collector who had Rod Jolley building new bodywork. 

0392AM was a factory team car, and driven for a couple of miles in the Mille Miglia by Giannino Marzotto and Gioia Tortima (entered as 375 MM), it dnf in the 24h Le Mans race driven by Louis Rosier and Roberto Manzon, it was sold to Erwin Goldschmidt before the Carrera Panamericana in exchange for 0376AM. Umberto Maglioli won the CP race, using a 24 twin spark plug GP engine. Later it was raced by Goldschmidt and was then sold to George Reed. In 1959 a Chevy engine was installed followed in 1964 by a Pontiac engine. Edwin Niles owned at a certain point of time the remains of the 375 Plus, the remains and the engine ended up with Kerry Manols, Christchurch Restoration of New Zealand performed the rebuild and today it is part of the Perfetti collection.

0394AM was an engine only

0396AM was a factory team car; it won the 24h of Le Mans with Froilan Gonzales and Maurice Trintignant. It was sold to John Edgar. Robinson was killed on the first leg of the Carrera Panamericana. In 1955 0396AM was rebodied by Scaglietti and raced in the States from 1955 until 1957. In 1981 Pierre Bardinon acquired the 375 Plus and had it rebodied as PF Spyder.  

0398TF was a factory team car and was sold to South America. Diaz Saenz Enrique Valiente raced the car in Argentina. In 1957 it was sold to Luis Milan. In 1983 it was offered by the Vintage Car Store of Nyack, today it is a part of the Ralph Lauren collection. 

0400AM was a factory team car and is missing

0478AM was delivered to Tony Parravano, raced by Jack McAfee, Carroll Shelby and Ken Miles, after a crash in Palm Springs the chassis was shortened and it was rebodied by Jack Sutton. The new owner was Frank Arciero and it was raced by Dan Gurney, Bob Oker and Tony Settember.
Today it belongs to "` | ´" .

0488AM was a Pinin Farina Cabriolet and delivered to King Leopold of Belgium; in 1969 it was offered in Car & Driver for $12.000. Today it is joined by the 375 MM Bergman Coupe.