Edelbrock part # 8100 is an adjustable Dual-Feed Fuel Log for Holley/Demon 4150/4500 series carburetors. Part # 8100, availabIe via Marken Performance, 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. There are 2 1/8" NPT ports for use with a gauge or pressure transducer. It's finished in a sleek black anodized for a great look. 8100 kit contents includes two aluminum gaskets, two O-rings, -10AN plug and -8AN Male x -10AN port fitting.