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 - 34 to 13 - 12. It also features swivel ball socket ends that can be adjusted to clear various air cleaners and carburetor linkage accessories. Also includes two 18 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.