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Don't know if this will help or not bonilla... but stainless melts at a lower temp than carbon steel. So, it will heat up faster. I think the routing (sharp bends and/or pipe close to head) of the header would impact head temps more than what material its made of.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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