Ray
Regarding the very long length of the big six, I can't find an explanation other than that it was designed in an era (circa 1937) when they needed a lot of iron to guarantee strength and it was intended for an application where weight wasn’t much of an issue. Also a diesel version was introduced a year later so maybe they wanted to be very sure it would be strong enough.
The post war version had revised porting with a port for every valve. (Six intakes & six exhausts)
Here is a cutaway:
By
ortegren1924
