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4 bolt vs. 6 bolt Valve Covers on RB Engines
The RB engines from 1959 through 1962 used 4 bolts to tighten
the valve cover.
In 1963, Chrysler changed to a 6 bolt cover when they added bolts
to the outboard corners front and rear.
On a few early 1963 engines you will find the transition valve cover.
It is 4 bolt cover with
Carl Bilter adds: "The 4 to 6 bolt valve cover was a running change during the 1963 model year, starting February 1, 1963. The 300J retained the 4-bolt covers. The K/RamK had 6 bolt covers. 
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