| 11.1.1958 | Preliminary Miami [BM+CM+DM+EM+FM+BP] | 6 | XKSS | Bob Stonedale | | DNA |
| 11.1.1958 | GP Ardmore | 26 | D-type | Bob Gibbons | J. Shelly | ?th |
| 11.1.1958 | Preliminary Miami [BM+CM+DM+EM+FM+BP] | 60 | D-type | Walt Hansgen | Briggs Cunningham | 3rd |
| 11.1.1958 | Preliminary Miami [BM+CM+DM+EM+FM+BP] | 61 | D-type | Ed Crawford | Briggs Cunningham | 7th |
| 11.1.1958 | Preliminary Miami [BM+CM+DM+EM+FM+BP] | 62 | D-type | Boss | Briggs Cunningham | 5th |
| 11.1.1958 | Preliminary Miami [BM+CM+DM+EM+FM+BP] | 124 | XKSS | Peter Templar | | 8th |
| 12.1.1958 | SCCA National Miami [BM+CM+DM+EM+FM+BP] | 6 | XKSS | Bob Stonedale | | DNF |
| 12.1.1958 | SCCA National Miami [CP+DP+EP+GM] | 28 | XK140 MC | Jerome Robinson | | DNA |
| 12.1.1958 | Preliminary Miami [CP+DP+EP+GM] | 28 | XK140 MC | Jerome Robinson | | DNA |
| 12.1.1958 | SCCA National Miami [BM+CM+DM+EM+FM+BP] | 60 | D-type | Walt Hansgen | Briggs Cunningham | 1st |
| 12.1.1958 | SCCA National Miami [BM+CM+DM+EM+FM+BP] | 61 | D-type | Ed Crawford | Briggs Cunningham | 2nd |
| 12.1.1958 | SCCA National Miami [BM+CM+DM+EM+FM+BP] | 62 | D-type | Boss | Briggs Cunningham | 3rd |
| 12.1.1958 | SCCA National Miami [CP+DP+EP+GM] | 89 | XK140 | Dick Shaddelee | | 13th |
| 12.1.1958 | Preliminary Miami [CP+DP+EP+GM] | 89 | XK140 | Dick Shaddelee | | 18th |
| 12.1.1958 | SCCA National Miami [BM+CM+DM+EM+FM+BP] | 124 | XKSS | Peter Templar | | 7th |
| 12.1.1958 | Preliminary Miami [CP+DP+EP+GM] | 333 | XK120 M | John Simmons | | DNA |
| 12.1.1958 | SCCA National Miami [CP+DP+EP+GM] | 333 | XK120 M | John Simmons | | DNA |
| 12.1.1958 | Preliminary Miami [CP+DP+EP+GM] | 621 | | Don Smith | | 16th |
| 12.1.1958 | SCCA National Miami [CP+DP+EP+GM] | 621 | | Don Smith | | 9th |
| 8.2.1958 | Preliminary Pomona [Production +2.7] | 17 | XK120 M | Bob Harris | Bob Harris | 7th |
| 8.2.1958 | Preliminary Pomona [Production +2.7] | 37 | XK120 | Mel Robles | Mell Robles | 8th |
| 8.2.1958 | Preliminary Pomona [Production +2.7] | 173 | XK120 | Barney Rushing | Barney Rushing | DNF |
| 8.2.1958 | Preliminary Pomona [Modified +1.5] | 204 | Special | Don Hulette | Don Hulette | DNA |
| 9.2.1958 | Pomona [Production +2.0] | 17 | XK120 M | Bob Harris | Bob Harris | 9th |
| 9.2.1958 | Pomona [Production +2.0] | 37 | XK120 | Mel Robles | Mell Robles | 11th |
| 9.2.1958 | Pomona [Production +2.0] | 173 | XK120 | Barney Rushing | Barney Rushing | DNF |
| 9.2.1958 | Pomona [S+1.5] | 204 | Special | Don Hulette | Don Hulette | DNA |
| 9.2.1958 | Guadalajara | | Special | | | DNS |
| 9.2.1958 | Guadalajara | | D-type | Jack Ensley | | DNA |
| 9.2.1958 | Guadalajara | | D-type | Jose A. Segura | | DNF |
| 16.2.1958 | Preliminary New Smyrna Beach [Modified] | 17 | D-type | Jack Ensley | | DNA |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | 17 | D-type | Jack Ensley | | DNA |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | 89 | | Dick Shaddelee | | DNA |
| 16.2.1958 | Preliminary New Smyrna Beach [BP+CP+DP+EP] | 89 | | Dick Shaddelee | | DNA |
| 16.2.1958 | Preliminary New Smyrna Beach [Modified] | 111 | D-type | Harry Rollings | | raced |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | 111 | D-type | Harry Rollings | | 4th |
| 16.2.1958 | Preliminary New Smyrna Beach [BP+CP+DP+EP] | 128 | | W. F. Flagg | | DNA |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | 128 | | W. F. Flagg | | DNA |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | | D-type | Walt Hansgen | Briggs Cunningham | DNA |
| 16.2.1958 | SCCA Regional New Smyrna Beach [Modified+BP+CP+DP+EP] | | | | | ?th |
| 16.2.1958 | Willow Springs [Main] | | XK140 | Bob Kudler | | DNA |
| 1.3.1958 | Preliminary Phoenix [Novice] | 8 | XK120 M | Dick Wells | | 7th |
| 2.3.1958 | SCCA Regional Phoenix [Production] | 8 | XK120 M | Dick Wells | | 7th |
| 2.3.1958 | SCCA Regional Phoenix [Main] | 8 | XK120 M | Dick Wells | | 21st |
| 2.3.1958 | SCCA Regional Phoenix [BP+CP+DP+EP] | 8 | XK120 M | Dick Wells | | 4th |
| 2.3.1958 | SCCA Regional Phoenix [BP+CP+DP+EP] | 52 | XK120 M | Hap Richardson | | DNF |
| 2.3.1958 | SCCA Regional Phoenix [Production] | 191 | XK140 MC | Roy Heath | | DNS |
| 2.3.1958 | SCCA Regional Phoenix [BP+CP+DP+EP] | 191 | XK140 MC | Roy Heath | | 5th |
| 9.3.1958 | Preliminary Boca Raton [BP+CP+DP+EP] | 5 | | Ed Wilson | | ?th |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 5 | XK140 | Ed Wilson | | ?th |
| 9.3.1958 | SCCA Regional Mansfield [CM+DM+EM+FM+GM] | 12 | C-type | Mason O'Keiff | | 4th |
| 9.3.1958 | Preliminary Mansfield [CM+DM+EM+BP+CP] | 12 | C-type | Mason O'Keiff | | 5th |
| 9.3.1958 | Preliminary Mansfield [CM+DM+EM+BP+CP] | 16 | XKSS | Bob Stonedale | | 4th |
| 9.3.1958 | SCCA Regional Mansfield [CM+DM+EM+FM+GM] | 16 | XKSS | Bob Stonedale | | DNF |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 17 | D-type | Jack Ensley | | raced |
| 9.3.1958 | Preliminary Boca Raton [CM+DM+EM+FM+GM] | 17 | D-type | Jack Ensley | | raced |
| 9.3.1958 | Preliminary Boca Raton [BP+CP+DP+EP] | 31 | | Bob Colosia | | raced |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 31 | | Bob Colosia | | raced |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 49 | D-type | George Constantine | Robert Harrison | raced |
| 9.3.1958 | Preliminary Boca Raton [CM+DM+EM+FM+GM] | 49 | D-type | George Constantine | Robert Harrison | raced |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 111 | D-type | Harry Rollins | | raced |
| 9.3.1958 | Preliminary Boca Raton [CM+DM+EM+FM+GM] | 111 | D-type | Harry Rollins | | raced |
| 9.3.1958 | SCCA Regional Boca Raton [CM+DM+EM+FM+GM+BP+CP+DP] | 621 | | Don Smith | | raced |
| 9.3.1958 | Preliminary Boca Raton [BP+CP+DP+EP] | 621 | | Don Smith | | raced |
| 16.3.1958 | Lago de Guadalupe | | XK120 | Manuel Cortez | | raced |
| 1958 | Plains Premiere [BP+CP+DP+EP+FP] | 14 | | Vern Knickerbocker | | raced |
| 1958 | Texas [Modified] | | XKSS | Bob Stonedale | | DNS |
| 1958 | Hawaii [S+1.6] | | XK140 | J. Riley | | DNF |
| 1958 | Preliminary Plains Premiere [BP+CP+DP+EP] | | XK120 M | Dick Wells | | ?th |
| 1958 | Plains Premiere [BP+CP+DP+EP+FP] | | XK140 | Bill Fritz | | ?th |
| 1958 | Preliminary Hawaii [Production +1.6] | | XK140 | J. Riley | | 3rd |