413 Cross Ram
This is a photo of a 1961 Plymouth Savoy - 413 "Sonoramic" Cross Ram Engine. In 1960, Chrysler introduced this wild aluminum cross-ram intake option for the motor, which suspended the carburetors over the fenders and fed the air/fuel mixture through long two runners which ran over the valve covers on opposite sides of the engine. In short, the carb on the right feeds the left side of the engine and the carb on the left feeds the right side. The cross-rams helped Mopar win a combined nine races on the Grand National (NASCAR) circuit that year. The 413 was also on the streets during that era, and was one of the few engines (the Hemi being the other) that could truly be considered as being designed specifically for racing. While both of these engines could be classified as high-performance street engines, the engineers were busy designing a motor designed strictly for drag and oval-track racing. This wild intake option was only available for a few years.
The "X" is open to a little interpretation as it's partially obscured by the distributor in this image. Mouse over the image to see the notes. It's a little more obvious when viewed large size.
413 Cross Ram
This is a photo of a 1961 Plymouth Savoy - 413 "Sonoramic" Cross Ram Engine. In 1960, Chrysler introduced this wild aluminum cross-ram intake option for the motor, which suspended the carburetors over the fenders and fed the air/fuel mixture through long two runners which ran over the valve covers on opposite sides of the engine. In short, the carb on the right feeds the left side of the engine and the carb on the left feeds the right side. The cross-rams helped Mopar win a combined nine races on the Grand National (NASCAR) circuit that year. The 413 was also on the streets during that era, and was one of the few engines (the Hemi being the other) that could truly be considered as being designed specifically for racing. While both of these engines could be classified as high-performance street engines, the engineers were busy designing a motor designed strictly for drag and oval-track racing. This wild intake option was only available for a few years.
The "X" is open to a little interpretation as it's partially obscured by the distributor in this image. Mouse over the image to see the notes. It's a little more obvious when viewed large size.