Yep, it's probably best to go with something that's worked for 70-something years. The "216" I'm building will have 40-something PSI of oil pressure or more in that line at times, but that's still within the working range of copper tubing. How strange is that?- - - - - -a 216 with real oil pressure?
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!