Baz is dead right over a/freeze ratio,I run a workshop that does loads of cyl heads and we see loads pitted due to a/f ratios being wrong or incorrect a/f being used,it also effects boiling point, ask any Spitfire pilot (glycol cooling system). 
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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