Carb repairs

[cajun31]

The specs on the alumaloy state that the melting temperature should be 728 degrees. Both MAPP and Propane easily reach that temperature although as you suggested the MAPP gets hotter quicker. Also the No Flux rods are supposed to be compatible with zinc. From the specs

• No Flux - Works with aluminum, aluminum alloy, die-cast, bronze, nickel, titanium, zinc, copper, brass & most non-ferrous (non-magnetic) metals (does not work with steel except for galvanized steel) lets you apply quickly & easily with any handheld torch Oxyacetylene, Mapp, Map/Pro or Propane like the best metalwork enthusiasts do.
• Superior Performance - Much lower working temperature than the vast majority of comparable products (728 deg F / 387 deg C) lets you repair & fabricate a far greater range of aluminum and other non-ferrous metal parts. It's never been easier.