Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Cummins HRBB-600 diesel engine, left front view. Factory photo. May 7, 1951

Cummins HRBB-600 diesel engine, left front view. Factory photo. May 7, 1951

Model 377 gas engine used in C model trucks. Factory photo. May 18, 1951

Model 377 gas engine used in C model trucks. Factory photo. May 18, 1951

Model 377 gas engine used in C model trucks. Factory photo. May 18, 1951

Model U90, built for US Navy, shows left side of engine. Factory photo. July 23, 1951

Luberfiner oil filter lines going into engine. Factory photo. Aug 3, 1951

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Model U90, built for U S Navy, looking down on engine and driving controls Factory photo Sept 20, 1951

Autocar engine model U90, built for US Navy, engine from right front. Factory photo. Sept 20, 1951

Autocar engine model U90, built for US Navy, engine from right side. Factory photo. Sept 20, 1951

Caption Missing. Click to us identify this photograph.

Autocar engine model U90, built for U S Navy, left side of 501 engine. Factory photo. Oct 3, 1951

Autocar engine model U90, built for US Navy, right side of 501 engine. Factory photo. Oct 3, 1951