Monobloc
A 322 cu in (5.28 L) "monobloc" engine was used in 1936's Series 60. It was designed to be the company's next-generation powerplant at reduced cost from the 353 and Cadillac V12. The monobloc's cylinders and crankcase were cast as a single unit, and it used hydraulic valve lifters for durability. This design allowed the creation of the mid-priced Series 60 line.
Bore was 3.375 in (85.7 mm) and stroke was 4.5 in (110 mm). This engine was modified with a 3.5 in (89 mm) bore for the 1936-1948 346 cu in (5.67 L) engine. This was used in the Series 60/60S/61/62/63/65/67 and 70/72/75. It was also used in tanks, e.g. M5 Stuart, in World War II.
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