MP P4120492 Umbrella Style Viton Valve Seals were mentioned in several of the 246 search results dating back to 2001.

Teflon were noted to require guides to be machined.

For a daily driver, stock compression & intake/exhaust, are the Viton seals still best bet & adequate for my 65 225:?:

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1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/

thats what I plan to use on my car with mild head work 2bbl and a 4 speed I will be putting the engine together soon ill let you know how they work (also they look different then in the pic their is a short and a long seal the short goes on the exh. valve)

You needn't pay MP markup for valve stem seals...

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

they only list for $16.00

http://www.wholesalemopar.com/parts.htm

$15

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1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/