I'm not running a water pump, and there is the 4 holes on the front of the block, does it matter which ones are in and which ones are out? I'm assuming the top ones are in.

 

I am not certain on this but based upon "theory"...and we know how that goes...I would think the top ones would be going out of the block with the warmer coolant (heat rises). Strictly theory!!

 

I searched all over but couldn't find anything

 

Well with a stock water pump the heater core hoses come out the bottom right??? So I would say the bottom holes are out.... But I'm not sure....

 

Bottom in top out

Tim

 

Boy. You have some $$$ tied up in that plumbing.

Are those little AN fittings really going to flow enough to cool your engine?

 

its all -8 and yeah it will flow plenty. its fairly high pressure 75-85* fresh water. open cooling. run a single inlet and dual outlets as to prevent from pressurizing the block. as for the expense, I have a buddy hooking it up so all the hose and fittings were right around 170$

 

I have a rad mouted pump on mine with -12 fittings

stupid amount of $ in it but I had to have it once I saw it.

Tim

 

i spent more plumbing it with stainless hardline last season. I woulda done it again if it wasn't for my buddy's hook up

 

Some pressure in the block is a good thing. It keeps the water in good contact with the hot metal, and prevents steam pockets from forming, which will force the water away from the metal, making the metal run hotter, which will make the steam pocket larger....kinda of a self fulfilling thing. Don't want to restrict the flow to much to get pressure though, in cooling flow is king.

Awesome job or your boat BTW. I too, over the years, have made many parts with a jig saw, sawzall, drill press, and upright belt sander. You can do a lot with a little as long as you are willing to spend the time, and you take pride in your craftsmanship...and I can see you do. For the last 3 years, I have had CNC equipment available to me...cutting the piece out is quick but the CAD work takes some time. If you need more then one piece that is the same though, it is great.

Once again, great job, great craftsmanship

Bill

P.S. The top holes are out...they lead to the heads, the bottom holes are in.