The Mopar performance “viton” valve seal package came with 8 short and 8 long umbrellas(P4120492).
In the Fel-Pro catalog the long umbrellas are listed as the “early” style(SS12419).
Since the bottom of the seal is hidden by the spring/damper in the OP’s pic, it’s hard to say for sure which style seal it is, but I thought it seemed like it was the “short” style on that ex valve.
there's a third type of factory seal. it fits the '452 head intake boss. it's a push on neoprene and reminds you of a positive seal.
