This is a vintage Mike Kuhl Racing Enterprises blower adapter/spacer to spread out two Holley carbs on a blower. This allows for two Holley carbs to be run in normal front to rear spacing...meaning you don't have to turn them sideways like many other spacers. This came off a Kuhl 671 blower and had two Holley 850 double pumpers on it. This item is very clean and shows normal wear for a 40 year old part. Buyer to pay shipping.