Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1967 | SF | 14 | 50 | 23 | 46.0 | 211 | 0 | 7 | 3 | 4.2 | 18.4 |
| 1969 | SF | 6 | 146 | 81 | 55.5 | 926 | 5 | 11 | 11 | 6.3 | 54.8 |
| 1970 | SF | 14 | 4 | 3 | 75.0 | 49 | 1 | 0 | 0 | 12.2 | 155.2 |
| 1971 | SF | 6 | 4 | 1 | 25.0 | 46 | 0 | 0 | 0 | 11.5 | 75.0 |
| 1972 | SF | 13 | 269 | 147 | 54.6 | 1983 | 18 | 16 | 14 | 7.4 | 75.9 |
| 1973 | SF | 11 | 157 | 83 | 52.9 | 882 | 4 | 7 | 13 | 5.6 | 59.5 |
| 1974 | SF | 3 | 3 | 1 | 33.3 | 2 | 0 | 0 | 1 | 0.7 | 42.4 |
| 1975 | SF | 11 | 207 | 102 | 49.3 | 1151 | 5 | 7 | 11 | 5.6 | 60.3 |
| 1976 | TB | 14 | 311 | 156 | 50.2 | 1628 | 7 | 12 | 32 | 5.2 | 57.1 |