| Maker | Akron-Funk | Allison | Continental 7,8,9-A-50 | Continental 7,8,9-A-65 | Continental 8,9-A-75 | Continental 8,9-A-80 | Continental W670-M1 |
| Arrangement | IV-L | V-60 | Horizontal | Horizontal | Horizontal | Horizontal | Radial |
| Cooling | Water | Liquid | Air | Air | Air | Air | Air |
| No of Cyls | 4 | 12 | 4 | 4 | 4 | 4 | 7 |
| Bore/Stroke | 3.875" x 4.25" | 5.5" x 6.0" | 3.875" x 3.625" | 3.875" x 3.625" | 3.875" x 3.625" | 3.875" X 3.625" | 5.125" X 4.625" |
| Displacement | 200 cu ins | 1710 cu ins | 171.05 cu ins | 171.05 cu ins | 171.05 cu ins | 171.05 cu ins | 668 cu ins |
| Comp Ratio | 6.25:1 | 6.65:1 | 5.40:1 | 6.30:1 | 6.30:1 | 7.50:1 | 6.10:1 |
| bmep Cruise | 117 | 146 | 122 | 131 | 134 | 137 | 135 |
| Blower ratio | N/A | 8.77 | N/A | N/A | N/A | N/A | N/A |
| Cyl Material | C/Iron | N/Iron | Steel | Steel | Steel | Steel | Steel |
| Valves per cyl | 1 Inl 1 Exh | 2 Inl 2 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh |
| Valve Arr. | L Head | OHC | OHV | OHV | OHV | OHV | OHV |
| HP max - not Take-Off | 63 | 960 | 50 | 65 | 75 | 80 | 250 |
| @ RPM | 2125 | 2600 | 1900 | 2300 | 2600 | 2700 | 2200 |
| @ Altitude | Sea Level | 12000ft | Sea Level | Sea Level | Sea Level | Sea Level | Sea Level |
| HP Take-Off | NA | 1090 | 50 | 65 | 75 | 80 | 250 |
| @ RPM | NA | 3000 | 1900 | 2300 | 2600 | 2700 | 2200 |
| HP Cruise | NA | 720 | NA | NA | NA | NA | NA |
| @ RPM | NA | 2230 | NA | NA | NA | NA | NA |
| Fuel Octane | 73 | 100 | 65 | 73 | 73 | 80 | 80 |
| Prop Drive | Direct | Geared | Direct | Direct | Direct | Direct | Direct |
| Dry Weight | 255lbs | 1340lbs | 160lbs | 160lbs | 170lbs | 173lbs | 460lbs |
| lb/Cruise HP | 4.05 | 1.86 | 3.20 | 2.46 | 2.27 | 2.16 | 1.84 |
| Carb(s) | 1x Zenith | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Marvel |
| Ignition | Bosch Mag | Scintilla Mag | Scintilla mag | Scintilla Mag | Scintilla Mag | Scintilla Mag | Scintilla Mag |
| Electric Starter | NA | Eclipse | Eclipse | Eclipse | Eclipse | Eclipse | Eclipse |
| Length | 35" | 98.53" | 30.406" | 30.406" | 30.406" | 30.406" | 34.1875" |
| Height | 25" | 41.1875" | 23" | 23" | 23" | 23" | 42.50" |
| Width | 16" | 29.28" | 31.6875" | 31.6875" | 31.6875" | 31.6875" | N/A |
| Ht above bed | NA | 23.312" | N/A | N/A | N/A | N/A | N/A |
| Mount Dia / Bearer Spacing | NA | 18.375" | N/A | N/A | N/A | N/A | 20" |