I think the MAPP torch tip can better withstand the higher heat than the propane tip. I know when I used a TurboTorch with acetylene it didn't like being throttled down, the tip would be bright red unless you turned the torch up all the way, it has to pull in enough air to help cool the tip. I think the MAPP tips are designed to do that.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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