usualy but not always

Ok I pressured up the manifolds, one held constant the other however did not even hold any. I will pull it to inspect tommorrow. Do you think that I should replace both manifolds or all four And if so what would you recomend?

Most recomend replacment. If you run in Salt it is only a matter of time.

I had a leak right at the top of the devider between runners. I had mine TIG welded 2 years ago. and it is fine. My manifolds had run in salt, I run in fresh.

How old are your manifolds? Mine are 10yrs old if they are original, andhave been run in the salt.

I'm not sure on the age. They were used when I bought them. At 10 years old I would think they need checked very carefully or replaced.