The Chrysler A57 Multibank is a 30-cylinder 1,253 cu in (20.5 L) engine that was created in 1941 as America entered World War II.

[2] The combined assembly consisted of five of these straight-six engines mounted in a pseudo-radial fashion upon a central cast-iron crankcase.

[3] The arrangement employed a common radiator, water pump, oil pan & dual oil pumps,[3] with each of the five component crankshafts fitted with a geared flywheel that meshed with a central sun gear driving a main shaft running through the central crankcase.

[3][4] Each of the six-cylinder sub-blocks had an iron head and featured a Carter TD-1 carburetor and a 6.2:1 compression ratio,[1] with tuned pipes that fed into a common exhaust;[3] output was 370 hp (280 kW) at 2400 rpm.

[5] In the February 1944 issue of the magazine Popular Science, an advertisement by Chrysler claimed the A57 could still move the tank it was fitted in even if 12 out of its 30 cylinders were knocked out.