Multiple Spacers for S&S Super B and Super E Carburetors for Harley-Davidson

Yost claims that by adding more distance from the intake manifold to the carburetor, thus increasing the overall volume, these manifold spacers will increase your bike's power.
The spacers are machined from 6061 T6 aluminum and have a recess with an O-ring for proper sealing of the carburetor,
Super B and Super E 1 1/2" (38.1mm)