Does anyone know the chamber volume area 12A,  if the 13B is 40 cu.
ins.
George (down under)

Hi George; The Chamber volume multiplied by the ratio of their widths should
give it to you: 40 X 65/80 = 32.5 cu in or it 21st century terms 654 cc X
65/80 = 532cc  BR, Dave McC

 
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