Is there any difference between an intake with a small S vs one with a large S? They both have 68 date codes.

 

No they are both about the same and came in 2v and 4v versions. If you have one of each...which it sounds like ya do.....do a side by side and look at the runners, ports etc....and see. I have a C8AE-A on my GT 390. I still haven't looked to see if it's a large or small S tho. I'll check later. I've found both big and small 4v S intakes on GT cars stock. So from a performance standpoint they appear the same.

G.