Is anyone here using a BBK SSI cathedral port intake manifold? If so, what injector o-rings are you using? I have a set of LS3-style injectors I am trying to use and have the 14.5mm o-rings and they are "too fat". The i.d. on the intake is around 13mm but the o-ring just simply won't compress to slide in. I could probably hone out the intake receptacles but I want that to be a last resort.

Appreciate any feedback.

 

I used to have a BBK LS6 intake on my 98 Wrangler LS6 swap.
Are you going with the LS3 injectors because they are 42 lb compared to the stock LS6 28.8 lb injectors?
I would try LS6 o-rings or NAPA has a good selection of generic o-rings.

 

When I had my BBK intake I used GTP injectors with LS1 orings. You'd need LS1 length injectors or you need to use an adapter if they are shorter.

 

Guys, thanks for the replys and suggestions.

This will be a pump gas turbo setup. The injectors are the Holley 100lb that have the LS3 height. I have what would normally be the correct o-rings for intake, but after doing some research, I've discovered that the bottom o-ring groove on the injectors have a larger o.d. than regular LS1-style injectors. So, when the o-rings are installed, the o.d. of the injectors expand. I've discovered o-rings that have the same o.d. but the listed specs shows they have a larger i.d. They are Holley part # 534-104 and hopefully will solve this issue.

I don't know if the bottom o-ring groove of OEM LS3 injectors is the same as the Holley injector, but hopefully this info will help some someone else.