Need Parts

opps I should have said it is a Subaru engine

Search "radiator" here.

One of our members used (I think) a Saab radiator from the late 1980s—possibly this. It's nominally 13 inches tall by 23 inches wide. You put it ahead of the beam tilted back and build a small air dam under the body to scoop air into it, then shroud it so the air exits to the beam and out under the car. 1.5-inch pipes to the rear and plumb to the engine. For my TD replica (Honda Civic radiator, more upright than would work in a Speedster) I ran mine along the channels under the pan. Beck puts them inside the tube frame. Lots of easy ways to do it, the only really hard way is to put the rad in the back and try to make air go to it. That way lies heartbreak, mostly.

Look here.

And here.

I believe Greg at Vintage Motorcars uses a two-pass aluminum 1" tube size radiator. Give him a call.  The one I've seen is almost a work of art in itself and he uses A/N connections for the hoses. Another fantastic observation !  You need to try for the maximum amount of square inches of fin surface possible for the most effective cooling. After that, its core thickness and amount of tube rows.

Greg may ba able to help you with the A-1 exhaust as well.     If you can't talk to Greg for some reason, ask Anna to snag him for the info...........Bruce

Another way to do it also is to look at the subaru radiator and calculate the square footage and area and get something equivalent or bigger depending on what air flow you can add or fans.... I did that to make sure the dual rad setup would work inmy speedster. Good hunting