Earl's adjustable fuel log is designed for use with most dual inlet Holley carburetors w/ 7/8"-20 threads on the fuel bowls. The bowl extension adapters pivot at the fuel log end and this provides extra clearance & easier assembly. Includes fuel rail assembly w/ -8 AN Male Flare Inlet adapter, -10 AN O-ring plug, (2) 1/8" NPT Plugs, and sealing washers for the fuel bowls. Black anodized finish.