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| Type | Fixed-head coupé | Fixed-head coupé | Single Seater | | |
| Seats | | 1 | 1 | | |
| Doors | | 1 | | |
|
| Power-to-weight | | 410.3 hp/ton | 648.39 hp/ton | | |
| Specific Output | | 0 hp/cu in | 0 hp/cu in | |
|
| Engine | | Flat 6 | V 8 (90º vee) | | |
| Valves | | 4 valves per cylinder
24 total valves | | | |
| Displacement | 180 cu in | 244 cu in | 256 cu in | | |
| Bore x Stroke | | 4 in x 3 in
1.25 ratio | | | |
| Maximum power | 260 hp | 510 hp | 603 hp | | |
| Maximum RPM | | | 9000 | | |
| Fuel | | Petrol | Petrol | | |
| Sump | | Dry sumped | Dry sumped | | |
| Manufacturer | | | Gibson | | |
| Code | | | GK-428 | |
|
| Wheelbase | | 99 in | 118 in | | |
| Length | | 179 in | 187 in | | |
| Width | | 80 in | 75 in | | |
| Height | | 81 in | 41 in | | |
| Track | | | front: 62 in
rear: 61 in | | |
| Kerb weight | | 2740 lb | 2050 lb | |
|
| Engine location | | Middle | | | |
| Transmission | | 6, sequential manual
| 6, sequential manual
| | |
| Brakes | | front: Disc Ventilated
rear: Disc Ventilated
| front: Disc Ventilated
rear: Disc Ventilated
| | |
| Brake diameter | | front: 15 in
rear: 14 in
| | | |
| Wheels | | front: 12.5 18
| front: 12.5 18
rear: 13 18
| | |
| Tyres | | front: 30/68 R18
rear: 31/71 R18
| front: 30/68 R18
rear: 31/71 R18
| |
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