The Felpro gasket set I got for my 440 has 2 different kinds of valve seals. 8 with a good size cup comparable to the old ones already on my 346 head. The other 8 have barely any cup to them and don't even seat over the guide. I figured there was a mistake but when I went to order more there was intake and exhaust. I don't understand because the guides and stems all seem the same and the old ones were all the same. The shallow cup seals wouldn't even stay on the guide where as the deeper cups seated nicely(or does that matter?). Can someone learn me?