Ok guys, I'm leaving to much on the table with these log manifolds on my 460.  I've been looking for an alternative.   How are you guys making out that use the Bassett Thru Transom Headers  in an enclosed engine compartment?   Will they work with the tall valve covers?

Did you put in additional ventilation as in another blower?  Wrap the pipes with the header wrap?  Put the foil insulation on the inside of the engine compartment near the engine?

I added a picture to give you guys an idea of the engine area.  The other cover sits at the front.  This is an older picture with the real crap manifolds, we do have the long bolts on now.

How are you guys handling the exhaust.  Please don't say take off the ski deck and run over the transom... you'll make the wifes list too! 

Tom, do you guys sell this type header?

 

I was afraid of that.... the interior is so dang functional and comfortable.... now what.   

Where's the best place to buy a set of these headers?   I could make a winter project
out of it I guess...

I won't take it down over the summer.

You don't want those headers under a cover, unless you are looking to start a fire. First off they don't usually have water running thru them at low RPM's and will get very hot, even with water flowing they are not cool to the touch, and the weep holes that let out excess water will fill the area under the hatch with exhaust fumes.   If you want something covered you are going to need water JACKETED headers, I think Lightning Manufacturing makes them. 

http://www.boatheaders.com/

They aren't cheap, and I think they use a BBC header with an adapter plate.  Doesn't look like you have a lot of room to play with, if you could get the adapters or even have a set made it might open up some other doors, lot's more choices for the Chevy engines, IMCO, GLM, make HP manifold style exhaust for them, and that stuff is much cheaper and probably a bit narrower.  Won't necessarily flow like a tube header, but much better than the log style manifolds. 

That boat needs a set of water jacketed headers, i.e.  a tube inside a tube. 

Don't fix what ain't broke

Best advice yet.

 

   I think they got a little off track with the chebby chit.

Hard to believe that could happen on this forum   

Gotcha.  Thanks for the ideas