i am thinking about putting some O/T headers on my boat... i am goin to make them myself...
now i know there are dry and wet headers.. obviously dry headers have no water goin through them and wet ones do...

my quesion is... how does the wet header system work.. i see that the water inlet is at the bottom of the header.. how does watter not get in the motor???

and is it better to run wet or dry...??

thnks

thats what im goin to do, but the whole water thing is kinda scarin me..

so whn making a dry header to wet header how do u kno where to drill the holes??

Why take the time to build a set of headers if you don't even know if you'll like them?

Buy a set of used headers and install them with the water injection as designed, run them wet, run them dry and see if you even like them.  Then go forward with building your own headers as planned.

By the time you buy the flanges and tubing (not counting your time) you're going to spend almost as much as a good set of used headers.

The thing is that i have yet to see headers for a ford 390 motor

All right, all right... Let me start over. 

Remove 390, install 460, then...

Buy a set of used headers and install them with the water injection as designed, run them wet, run them dry and see if you even like them.  Then go forward with building your own headers as planned.

 

When you run the headers dry you get max performance from your headers.  I have heard that running a wet header robs a little power but I don't believe it is anything to worry about.  And as already mentioned, dry headers get hot!  REALLY HOT!!  So I would recommend running a wet and by using the basset t valve, it will keep water flow to your headers very low when at idle.  And as your engine rpm's rise the pump creates more pressue, opening the valve more and giving more water for your headers.  And unless you have a HUGE cam in your motor, you will not have a problem with getting water in the motor.   But i'm lazy and run a banderlog valve.