What's a "normal" oil seal? I'm not sure there's a lip seal made that replaces the rope seal on a 216, although it's possible to use a SKF part number 38649 full circle lip seal if you machine the back of the block and the rear main cap to accept it. Just be sure the counterbore is exactly concentric with the main bearing bore. I'm in the process of making an adapter plate to use my Van Norman cylinder boring bar to do that type of work by fabricating a surface-ground plate to bolt to the back of the block in place of the bellhousing to align the boring tool with the main bores. I'm located about 40 miles north of Huntsville Alabama near Fayetteville Tennessee.
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!