The Edelbrock fuel log #8100 is a great solution for getting the perfect fit on your Holley carburetor. It features a -10 AN telescoping center log that is adjustable from 7-3/4" to 13-1/2". It also features swivel ball socket ends that can be adjusted to clear various air cleaners and carburetor linkage accessories. Also includes two 1/8" NPT ports for use with a gauge or pressure transducer. It's finished in a sleek black anodized for a great look. Kit contents includes two aluminum gaskets, two O-rings, -10 AN plug and -8 AN Male x -10 AN port fitting.