That is, the block is air-cooled, but the cylinder heads are not. Due to the water cooling for those heads, the Singer DLS ...

This has proven to be a profitable venture as S&S engines not only provide more power than stock Harley blocks, they also ...

Primarily there are 2 types of cooling used for the engine. Air and Liquid. Air cooled engines are cheaper but the cooling may not be uniform since the rear portion of the cylinders cannot be ...