| BRM P25 |  | BRM 255 L4 |
| Connaught B |  | Alta GP L4 |
| Cooper T43 |  | Climax FPF L4 |
| Cooper T44 |  | Bristol BS2 L6 |
| Dunn ??? |  | Offenhauser L4 |
| Epperly Indy Roadster |  | Offenhauser L4 |
| Ferrari 500 |  | Ferrari 625 L4 |
| Ferrari 801 |  | Ferrari DS50 V8 |
| Ferrari D50 |  | Ferrari DS50 V8 |
| Kurtis Kraft 500B |  | Offenhauser L4 |
| Kurtis Kraft 500C |  | Offenhauser L4 |
| Kurtis Kraft 500D |  | Offenhauser L4 |
| Kurtis Kraft 500E |  | Offenhauser L4 |
| Kurtis Kraft 500F |  | Novi L8 c |
| Kurtis Kraft 500G |  | Offenhauser L4
@Offenhauser L4 c |
| Kurtis Kraft ??? |  | Offenhauser L4 |
| Kuzma Indy Roadster |  | Offenhauser L4
@Offenhauser L4 c |
| Lesovsky ?? |  | Offenhauser L4
@Offenhauser L4 c |
| Maserati 250F |  | Maserati 250F1 L6
@Maserati 250F1 V12 |
| Maserati 8CTF |  | Maserati L8 c |
| Phillips ??? |  | Offenhauser L4 |
| Schroeder ??? |  | Offenhauser L4 |
| Shilala ??? | | Offenhauser L4 |
| Snowberger ??? |  | Offenhauser L4 |
| Vanwall VW 5 |  | Vanwall 254 L4 |
| Watson Indy Roadster |  | Offenhauser L4 |
| Watts ??? | | Offenhauser L4 |