Nope, for modifying transfers , which became brownish (ie exhaust gases backflow) after approx. 15 hours of racing no any issue. Even 3450 for iron/steel parts was tested on CZ175 exhaust pipe header and aux exhaust port (but from outside of cylinder)
For conversion from reed to piston port cylinder by filling intake and reed flange with broken cooling fins and loctite mixture with grey iron dust..
No issues again, loctite gotta have some good heat transfer/conductivity
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