A case in point is this adjustable metering block derived from the stock metering block for Holley's PN 7448-350 two-barrel (2-bbl) carburetor. This unit was originally designed as a 350-cfm Ford ...

When you think about it, it's kind of funny that motor racing is one of the last places you will find a two-barrel carburetor. Meanwhile, you will have to look pretty long and hard to find a race car ...