I have a csr one which I tapped an inlet below the rad cap for the steam vent. Whilst not a ton of room still enough to burb the air out and is highest point.
May be pic in my gallery or I will get one later and put it on.
I didnt use a barb as I had all an fittings. For memory I used a 1/8 to -6 adaptor and then a 45degree fitting.
http://www.csr-performance.com/shop/...-to-1.5-inches
