The return of carburetor cores ensures the continuation of Sierra’s re-manufactured carburetor program. As such, Sierra has tried to simply the process as best as possible. First, the core charge is built into the price of the carburetor, eliminating multiple charges for the item. Second, to return the old core -simply place the old unit in the box the new re-manufactured unit was shipped, fill out and attach the supplied core tag, and ship to Sierra at the address on the return tag. Sierra will receive and process the core return, and issue a $75.00 check direct to the returnee listed on the tag.