BTW I gave up on my custom rad. I bought a 16 by 27 by 2.25 thick Howe rad
 from Summit Racing for $199.95. The core itself is actually 15 by 24

inches.

 It looks like a mass produced 2 tube row core designed for plastic end

tanks

 and Howe just welded on aluminum end tanks. It does indeed look like the
 tubes are aluminum furnace brazed into the header plates.

 I tried tig welding on a stock 2nd gen Mazda core and it can be done, no
problem.
 No melting of the brazed tubes takes place due to the convoluted shape
 of the stock header plates dissipating the heat before it can reach the
tubes.

 The labor involved is high however as you must clean the header plates
 thoroughly. Preferably with a caustic etch. Using stock cores would make
 my custom rad too thick for the space under the cowl so I gave up.
 Perhaps I could find thinner cores that would work but they would
 no be cheap.

 This Howe rad is a quick, simple and cheap solution. Took two days
 for Summit to get it to me. I will have to weld custom inlets
 and outlets on it but what the hey.

 Given the 25% rule for relatively thin rads the opening would be about
 90 square inches.

 Paul Lamar

Paul,
Are you saying that you will have a 90 square inch opening in the cowling of
the KIS?  That seems huge (9"x10").  Much bigger than the standard openings.
what am I missing?

Bill Schertz
KIS Cruiser #4045

Yes Bill. don't forget I am looking to cool 250 HP. My core is 15 by 24
or 360 sqaure inches. So 90 is about right. The Scoop will look
something like this one on this Turbo Lance. I can always make it
smaller if it proves too much. More about this airplane shortly.

Paul Lamar

Opps looks like I forgot the picture.
Here it is.

Paul Lamar
 
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