Are there really no options for valve stem seals other than crap rubber?

[pettybird]

My motor is together so I'm not going to cut it for PC seals. I'm just looking for any better option than the $1.50 rubber seals that haven't lasted 20k miles on my 440?  I saw one place makes them in silicone but I'm not sure about them, and I haven't found a source for Viton. Any suggestions?

[fy469rtse]

search the threads , magazine articals on engine head builds mopar action or muscle,
it goes back a long way, before aluminum heads became common
theres a cutter that uses the valve guide if your doing it your self , other wise get a machine shop to do it ,
but enables you to use the modern type seals the alloys have
discuss what you want with a head shop 
get them to port the shit out of them
so you can run a decent comp and avoid detonation

[PRH]

MP P4120492...... Viton material, not recommended for dual springs.

[pettybird]

MP P4120492...... Viton material, not recommended for dual springs.

Thanks!  I had only seen those listed as 'rubber'...stupid Summit