If you use hose and hose clamps for your cooling plumbing  you 
should take a look at this. This silicone rubber hose is about
a dollar a foot at McMaster Carr but it is about the best you can
buy. I also bought some Breeze constant torque heavy duty hose
clamps. This silicone hose is quite soft so a SS liner is needed in the hose
clamp to prevent the hose from extruding through the worm gear slots.
The constant torque feature means the clamp can expand and contract
slightly as the aluminum hose barb expands and contracts when
it warms up and cools down. The washers are actually Belleville springs
back to back. The Breeze part number is CT-200L.
McMaster Carr part #5281K-17.  I bought a box of ten for about $34. 

Well worth it. Not as good as AN but then again it will flow more
coolant with less pressure drop. 1-1/2" or AN -24 is hard to find
and real stiff. AN-20 is only 1-1/4" ID probably adequate but still
stiff. AN -20 also requires a lot of tig welding aluminum.

It does not pay to nickel and dime the coolant plumbing. A coolant system
failure can bring you down just as fast as a broken crankshaft
if we had crankshafts which we don't. So we don't need to worry about that :)

Paul Lamar
 
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