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My manifold came with a set of o-rings, but so did the rail kit. Here is a pic of what I have and I'll explain more below:
All 3 injectors are the same. On the right is with the stock o-ring that came on the injectors. Middle is the black o-ring that came with the rail kit. Left is the fat green one that came with my manifold and I had to pay extra for.
The injector on the right doesn't hold in place, obviously. The injector in the middle "pops" into place, but doesn't take as much force as I would expect. The injector on the left will NOT go anywhere and I've put significant force on it and lubed w/ oil.
So does someone with the same setup have a successful install with no leaks on the middle black o-ring and these injectors? If you use the green ones, did it feel incorrect because of the amount of force to get them in place?
My fast 102 came with I believe orange O rings. It's crazy I can't remember the color at this moment cause we literally just installed them. We used the O rings that came with the intake. Seemed to fit fine and I we uses the ls2 rail. We used the white gm ls1 style supercharged grand prix injectors. Not sure if that helps you any but this is what we did.
If the black feels snug with a bit of oil on them, go with the blacks.
I was missing some o-rings when I got my FAST 102, so I bought some of the black ones. Both fit for me, but the blacks were a bit looser (but not too loose).
They should fit tight, but if it feels wrong, it probably is.
03-07-2016, 08:48 PM
What o-ring for Denso 36lb injectors on FAST 102? 
