Bruce ( Shrinker )

Welcome to the forum..
I had a heck of a time tuning my Holley street demon 625's...
They were not made tuneable to run two at a time..
I've got them running relatively well and I guess what I would say good enough. But very finely tuned not yet. There was one magazine article when they first came out in 2012 where someone in Florida some high performance shop did a set of them and drilled holes in the secondary flaps. I actually ordered some extra secondary flaps and did that as well to help them open up...
Anyways I may get back to it a little bit more this next summer...