Don't they get too hot after running for periods of time?
Sent from my DROID RAZR using SoCal Jet Boats mobile app
Of course.
One thing to think about is that they are in an open engine compartment, air is constantly blowing across them and unlike cast manifolds, won't retain as much heat.
Do not take this the wrong way, they will get hot!
Generally not hot enough to cause damage to the gunnels.
-beerjet-