be sold to private racing teams. Ten cars of this type were produced. These customer competition (or in Italian "competizione clienti") cars were very similar to the production 275 GTB, differing only in the alloy bodywork, extra venting, added exterior fuel fillers and expanded capacity fuel tanks. The engine was a Tipo 213 unit with 6 carburetors, the same as fitted to production road-going 275 GTBs. These customer-competition 275 GTBs were created both to test the market for this type of GT racing car and as a gesture of compliance to the FIA, in hope of positively influencing the homologation process. 275 GTB/C For the 1966 season, Ferrari built a new series of 12 lightweight 275 GTB/C racing cars. Even though they outwardly resembled the road-going 275 GTB, the 275 GTB/C was thoroughly revised by Mauro Forghieri and his Scuderia Ferrari engineering team and differed from both the 275 GTB production car and earlier 275 GTB competition cars. Every panel of the body was altered and substantial mechanical changes were made. All 12 were constructed in 1966 between the end of the 275 GTB (two cam) production run and the start of the 275 GTB/4 (four cam) production run. Forghieri designed a special super-lightweight steel and aluminium version of the 275 GTB chassis, designated Tipo 590 A. The 4-wheel independent suspension was the same design as on the production 275 GTB, but used different shock absorber valving and stiffer springs. The disc brakes were also the same as those used on the production 275 GTB, but with quick-change racing brake pads. The body appeared superficially very similar to that of the production 275 GTB series II "long nose", but in fact was a completely new lightweight version constructed by Scaglietti. All body panels were changed, including wider front and rear fenders and a slightly shorter nose. The body was constructed from thick aluminium panels joined with rivets. This method of construction allowed easy replacement of body panels after an accident. The body panels were approximately half as thick as the ones used on the 250 GTO and the Shelby Cobra. This made the body lightweight but extremely fragile—even leaning on a 275 GTB/C would dent it. The entire rear section was reinforced by fiberglass to prevent it from flexing at the slightest impact. The 275 GTB/C was equipped with bumpers visually similar to those on the road version, but they