#8 stud on a diamond block engine.

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As I was working on a diamond block out of a Gleaner combine I found that the #8 head stud was the slightly longer one for the distributor cable clamp.

Since this is a 1937 engine built 6 years after Model A's ceased production it seems odd that they would still be installing the long stud, especially on an engine that was destined to go into a combine.