Schedule
The 13 championship races each counted towards one or more of the five divisions. [3]
Both championships scored points to the top six competitors in each class, under four different tables or 'Barème'. Barème I corresponded with the old order of 9-6-4-3-2-1. Barème II was in the order 10-7-5-4-3-2. Barème III, valid only for Le Mans, was in the order 12-9-7-5-4-3. Barème 0, valid only for the Grosser Bergpreis der Schweiz, was half of Barème I: 4.5-3-2-1.5-1-0.5. Constructors were only awarded points for their highest finishing car. Other finishers from the same manufacturer were merely skipped in the points count. [4]
Only the best 4 results counted towards the championship (5 in S3, 6 in S2). Points earned but not counted towards the championship total are listed in (brackets).
| IMC | ISCC S1 | ISCC S2 | ISCC S3 | Race | Circuit or Location | Date |
|---|---|---|---|---|---|---|
| R 1 | - | R 1 | R 1 |  24 Hours of Daytona | Daytona International Speedway | 5 February 6 February |
| R 2 | R 1 | R 2 | R 2 | 12 Hours of Sebring | Sebring International Raceway | 26 March |
| R 3 | - | R 3 | R 3 |  1000km Monza | Autodromo Nazionale Monza | 25 April |
| R 4 | R 2 | R 4 | R 4 | 1966 Targa Florio | Circuito delle Madonie | 8 May |
| R 5 | - | R 5 | R 5 |  1000km Spa | Circuit de Spa-Francorchamps | 25 May |
| R 6 | R 3 | R 6 | R 6 |  1000km Nürburgring | Nürburgring | 5 June |
| R 7 | - | R 7 | R 7 |  1966 24 Hours of Le Mans | Circuit de la Sarthe | 18 June 19 June |
| - | R 4 | - | - | Mugello 500 km | Mugello Circuit | 17 July |
| - | R 5 | - | - | Coppa Città di Enna | Autodromo di Pergusa | 7 August |
| R 8 | - | R 8 | - | Großer Preis von Hockenheim | Hockenheimring | 14 August |
| - | R 6 | R 9 | R 8 |  Grosser Bergpreis der Schweiz | Crans-Montana | 28 August |
| - | R 7 | - | - | 500 km Nürburgring | Nürburgring | 4 September |
| - | R 8 | R 10 | R 9 |  Austrian Sports Car Grand Prix | Zeltweg Airfield | September 11 |
Note: The Großer Preis von Hockenheim did not count towards the Over 2000cc division of the International Manufacturers Championship. [3]
