Quote Originally Posted by OH4CompG View Post
If you're getting 105 springs, you need retainers. Not 100% on if you need the viton valve seals with the S1X, but I would get them anyway and put them in regardless since you're already in there and it's easy at that point.

Did you not fully read my post? I already have crow 105's and LS1 style retainers installed along with the valve seals. My question is, do I need to change the standard LS1 retainers to the modified LS1 retainers?