The white ones we put in are 11/32 the brand was pioneer, the orange ones were not glued as they came off easy and had little tension, all i can say is we know of three 427's here in sydney including mine that had this smoke issue all three had orange seals all three were replaced with the white ones pictured and all three stopped smoking after this was done, the orange ones might work fine on the same head for a 347 but a 427 is a different ball game, maybe they just were not fitted correctly i don't know but i'm a happy chappy now and went cruising yesterday and it was nice to see NO smoke wafting out from my rear view mirror
