Nope- - - -rope seal only. You can swap an upper rubber seal by just loosening all the other main bearing cap bolts a couple of turns and letting the crank drop down a little. The rubber seal engines will also have the upper main bearing shells that can be rolled in and out with a cotter pin in the crankshaft oil passages.
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!