With a little bit (OK- - - -a lot!) of tinkering, the tall side cover can be adapted to a full pressure 235 or 261. It's not really worth the effort, as Ray Charles could "see" the difference, given a few minutes to examined it closely.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!