in 1934, the W-670 was based on the A-70 of 1929 with the
bore increased from 4.625 to 5.125 inches. Designated the R-670
by the U.S. military, this engine was also used in tanks (including
the M3 Stuart).
|7-cylinder, radial, air-cooled,
|Displacement: 668 cubic inches (10.9 liters)|
|Bore x stroke: 5.125 x 4.625 in|