had 2 replace these group of seals along with 1-3. 1-3 went in easy 4-6 have been a battle blowin fuel everywhere. ill get 1 seated proper and 2 will blow fuel or get 2 seated and 1 blow. ive done this enough times 2 f.o. the group and just got another set. any advice before i do it for the 50th time how to get on first shot?