To swap to an LBZ bridge you need to swap to the LBZ/LMM runners as well. There is no need to do it, the openings on the LLY flanges are both bigger than the one inlet(intake horn) that feeds the two of them, even with the aftermarket 3" OD pieces.
If anything will help, it would be getting rid of the smaller intake horn and going to the one that Rick makes and is slightly larger.
The LB7 bridges are actually larger inside than the LLY's, and they do have the same flanges so mating to the LLY intake runners is not a problem. POSTED BY: [email protected] SDP