| 9.2.1958 | Pomona [S+1.5] | | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | DNA |
| 2.3.1958 | SCCA Regional Phoenix [Main] | | Scarab Mk I #001 (Troutman-Barnes) | Kessler / Ginther | Lance Reventlow | DNS |
| 13.4.1958 | SCCA Regional Palm Springs [BM+CM+DM+EM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | DNS |
| 4.5.1958 | SCCA National Virginia [BM+CM+DM+EM+FM+BP+CP] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 3rd |
| 4.5.1958 | Preliminary Virginia [BP+CP+BM+CM+DM+EM+FM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 5th |
| 31.5.1958 | Preliminary Santa Barbara [Modified +1.5] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | DNA |
| 1.6.1958 | Santa Barbara [BM+CM+DM+EM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 1st |
| 1.6.1958 | Consolation Santa Barbara [Modified] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 1st |
| 28.6.1958 | Preliminary Riverside [Modified +1.5] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | 1st |
| 29.6.1958 | Riverside [BM+CM+DM+EM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | DNF |
| 3.8.1958 | SCCA Regional Minden [BM+CM+DM+EM] | 216 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 1st |
| 17.8.1958 | SCCA National Montgomery [BM+CM+DM+EM] | 6 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Reventlow Automobiles | DNF |
| 31.8.1958 | Preliminary Thompson [BM+CM+DM+EM] | 160 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | 5th |
| 1.9.1958 | SCCA National Thompson [BM+CM+DM+EM+FM] | 160 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Reventlow Automobiles | 1st |
| 14.9.1958 | SCCA Regional Meadowdale [BM+CM+DM+BP] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | 2nd |
| 12.10.1958 | USAC Riverside | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Reventlow Auto | DNQ |
| 25.10.1958 | Preliminary Minden [BM+CM+DM+EM] | 16 | Scarab (Troutman and Barnes) | Lance Reventlow | | 1st |
| 26.10.1958 | Minden [BM+CM+DM+EM] | 16 | Scarab (Troutman and Barnes) | Lance Reventlow | | DNF |
| 2.11.1958 | Palm Springs [Exhibition] | 16 | Scarab (Troutman-Barnes) | Lance Reventlow | Lance Reventlow | DNA |
| 8.11.1958 | Preliminary Laguna Seca [BM+CM+DM+EM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | 1st |
| 9.11.1958 | SCCA Regional Laguna Seca [BM+CM+DM] | 16 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | | 1st |
| 23.11.1958 | Pomona [BM+CM+DM+EM] | | Scarab Mk I (Troutman-Barnes) | Lance Reventlow | | DNS |
| 5.12.1958 | Governor's Trophy | 37 | Scarab Mk I #001 (Troutman-Barnes) | Lance Reventlow | Reventlow Automobiles | 1st |
| 7.12.1958 | Nassau Trophy | 37 | Scarab Mk I #001 (Troutman-Barnes) | Reventlow / Daigh | Reventlow Automobiles | 1st |