Rich,
The differences between the 1952 216 and the 1954 high-pressure 235 are relatively the same as the differences between the 1954 high-pressure 235 and the 261. In both cases, the differences are noticeable when you drive them.
1952 216 had
85 net hp 1952 235 had 95-98 net hp
1954 235 had
102-105 net hp 1954 261 had net 114-123 hp
What are the block and head casting codes on you engine?
