This page provides a detailed comparison of the specifications for the Allis Chalmers 7000 and the International Harvester 666.
| Allis Chalmers 7000 | International Harvester 666 | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | International Harvester |
| Engine Model | 2900 | D312 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Naturally aspirated |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 301 ci (4.9 L) | 312 ci (5.1 L) |
| Engine Rated Rpm | 2200 | 2000 |
| Engine Power Output Value | 117 hp (87.2 kW) | - |
| Transmission | ||
| Transmission Type | Partial power shift | Sliding gear |
| Transmission Forward Gears | 12 | 5 |
| Transmission Reverse Gears | 3 | 1 |
| Dimensions | ||
| Length Value | 183 | - |
| Operating Weight Value | 9550 lb (4332 kg) | 7053 lb (3199 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | IH Fast Hitch |
| Hitch Category | II | II |
| Hitch Position | Rear | Rear |
| Hydraulic System Type | Open center | - |
| Operator Station Type | Cab (Acousta-Cab optional or Acousta-Cab II from 1978) | Open or Two-post ROPS (optional) |
| Starter Type | Electric Starter | Electric |
