any issues replacing them on a holley

nope,they come out pretty easy.

Don't need them

Its my understanding you do ^^^^ in a marine environment.

Patients though. I use a little dowel or punch on the standard tubes and slip in so when you grip and turn you don't crimp the tube. Also reinstalling new ones I like to use a little blue loctite just to make sure they don't end up spitting out an exhaust valve or worse yet transferring from one bank to another. But like mike said they typically come out with a little twist and pull action.

Nope.
Not required

I have one on each carb that has a small crack, so for 30 bucks its piece of mind...........thanks guys

are you sure they are cracked,most have a slit or hole in them facing the carb in the middle of the bend.

ya Mike, its cracked up the side in the hole area, like it was pried up to straighten it

I bought an HP750 and a HP1000 cfm from AED, they turned the tubes 180 degrees with the small side facing the middle. They said the coast guard approved that setup.