I believe the only 261's equipped with hydraulic lifters were "Pontiac" automobile engines in Canada. Maybe one of our friends north of the border can confirm that? I'm working on a deep hole drilling guide similar to the fixture used to bore a gun barrel blank to put a lifter oil gallery in any stovebolt engine, 216, 235, or 261.
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!